Who first introduced a leap day and a 24-hour day?
๐บ Ancient Egyptians were the first to realise the need for a leap day. They discovered that the star Sirius lined up with the rising sun around the time of flooding every year and also noticed that Sirius lined up with the sun for about six hours (a ยผ a day) different every year. They inserted a leap day into their calendar for a while but then abandoned it.
๐บ They also invented the 24-hour day, divided into two cycles of 12 hours each, and helped pioneer the concept of time as an entity.
๐บ In the ancient Egyptian calendar, the year had 365 days and consisted of 3 seasons: Akhet (Flood), Peret (Emergence) and Shomu (Summer), plus an intercalary month of five epagomenal days treated as outside the year proper. Each season included 4 months of 30 days.
๐บ According to scientists, the ancient Egyptian calendar was highly accurate, a miracle of its time and contributed to the development of different ancient calendars.
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๐บ Ancient Egyptians were the first to realise the need for a leap day. They discovered that the star Sirius lined up with the rising sun around the time of flooding every year and also noticed that Sirius lined up with the sun for about six hours (a ยผ a day) different every year. They inserted a leap day into their calendar for a while but then abandoned it.
๐บ They also invented the 24-hour day, divided into two cycles of 12 hours each, and helped pioneer the concept of time as an entity.
๐บ In the ancient Egyptian calendar, the year had 365 days and consisted of 3 seasons: Akhet (Flood), Peret (Emergence) and Shomu (Summer), plus an intercalary month of five epagomenal days treated as outside the year proper. Each season included 4 months of 30 days.
๐บ According to scientists, the ancient Egyptian calendar was highly accurate, a miracle of its time and contributed to the development of different ancient calendars.
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What is the Hindu calendar?
The Hindu calendar, also called Panchanga, was developed in ancient times on the Indian subcontinent. The earliest mentions of Hindu time reckoning can be found in the Vedas, a body of sacred texts of Hinduism, some of which date back to around 1200 BCE.
It offers a multi-dimensional method of structuring time, combining information about lunar and solar days/months, the movements of the Sun and the Moon in relation to stellar constellations, and other astronomically defined time spans.
In fact, there is not one single Hindu calendar, and there are many regional variations of it.
๐ฎ๐ณ๐ฎ๐ฉ The Saka Samvat is used officially in India since 1957 and by Hindus in Java and Bali. It starts from 78 AD and is based on the tropical zodiac signs rather than the sidereal year - the time it takes Earth to orbit the Sun.
๐ณ๐ต๐ฎ๐ณ The Vikram Samvat is used in Nepal and some Indian states, starts from 57 BC and uses lunar months and the sidereal year.
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The Hindu calendar, also called Panchanga, was developed in ancient times on the Indian subcontinent. The earliest mentions of Hindu time reckoning can be found in the Vedas, a body of sacred texts of Hinduism, some of which date back to around 1200 BCE.
It offers a multi-dimensional method of structuring time, combining information about lunar and solar days/months, the movements of the Sun and the Moon in relation to stellar constellations, and other astronomically defined time spans.
In fact, there is not one single Hindu calendar, and there are many regional variations of it.
๐ฎ๐ณ๐ฎ๐ฉ The Saka Samvat is used officially in India since 1957 and by Hindus in Java and Bali. It starts from 78 AD and is based on the tropical zodiac signs rather than the sidereal year - the time it takes Earth to orbit the Sun.
๐ณ๐ต๐ฎ๐ณ The Vikram Samvat is used in Nepal and some Indian states, starts from 57 BC and uses lunar months and the sidereal year.
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What is the traditional Chinese calendar?
Although modern-day China ๐จ๐ณ relies on the Gregorian calendar, the traditional Chinese calendar still governs the dates of important holidays such as the Chinese Lantern Festival, and is used to select auspicious dates for weddings, funerals, moving, and starting businesses.
This calendarโs origins can be traced as far back as the 14th century BCE.
It has 12 months of 29 or 30 days that each begin on the first day of a new moon. Leap months, rather than days, are added as needed.
Each month can be referred to by an animal name or a number within each 60-year cycle, which also correspond to particular hours of the day, as well as years in the zodiac cycle. This pattern dates back about 2000 years.
In order of occurrence, the animals are
๐
๐
๐
๐
๐
๐
๐
๐
๐
๐
๐
๐
๐ฐ๐ต๐ฐ๐ท๐ป๐ณ๐ฏ๐ต Variations of the traditional Chinese calendar are used in Korea, Vietnam and the Ryukyu Islands.
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Although modern-day China ๐จ๐ณ relies on the Gregorian calendar, the traditional Chinese calendar still governs the dates of important holidays such as the Chinese Lantern Festival, and is used to select auspicious dates for weddings, funerals, moving, and starting businesses.
This calendarโs origins can be traced as far back as the 14th century BCE.
It has 12 months of 29 or 30 days that each begin on the first day of a new moon. Leap months, rather than days, are added as needed.
Each month can be referred to by an animal name or a number within each 60-year cycle, which also correspond to particular hours of the day, as well as years in the zodiac cycle. This pattern dates back about 2000 years.
In order of occurrence, the animals are
๐
๐
๐
๐
๐
๐
๐
๐
๐
๐
๐
๐
๐ฐ๐ต๐ฐ๐ท๐ป๐ณ๐ฏ๐ต Variations of the traditional Chinese calendar are used in Korea, Vietnam and the Ryukyu Islands.
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What calendar is used by Muslims?
โช๏ธ๐The Hijri calendar or the Muslim/Islamic calendar is used by Muslims around the world to determine the dates of religious events and observances.
๐Its time reckoning is tied to the Moon phases. Each month lasts for a full lunation, the time span from one New Moon to the next.
๐It has 12 months with 29 or 30 days. The months of Rajab, Dhลซ al-Qaโdah, Dhu al-แธคijjah, and Muแธฅarram are considered sacred.
๐This calendar is completely detached from astronomical seasons. So, an Islamic year is about 11 days shorter of the solar year and for practical reasons most Muslim countries officially use the Gregorian calendar.
๐Islamic time reckoning begins in 622 CE when the Muslim prophet Muhammad migrated to Medina. This event is referred to as Hegira or Hijrah.
โน๏ธSince the Islamic calendar years are shorter than Gregorian years and the current year number is lower, the year numbers of the two calendar systems will coincide on May 1, 20874 CE/AH.
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โช๏ธ๐The Hijri calendar or the Muslim/Islamic calendar is used by Muslims around the world to determine the dates of religious events and observances.
๐Its time reckoning is tied to the Moon phases. Each month lasts for a full lunation, the time span from one New Moon to the next.
๐It has 12 months with 29 or 30 days. The months of Rajab, Dhลซ al-Qaโdah, Dhu al-แธคijjah, and Muแธฅarram are considered sacred.
๐This calendar is completely detached from astronomical seasons. So, an Islamic year is about 11 days shorter of the solar year and for practical reasons most Muslim countries officially use the Gregorian calendar.
๐Islamic time reckoning begins in 622 CE when the Muslim prophet Muhammad migrated to Medina. This event is referred to as Hegira or Hijrah.
โน๏ธSince the Islamic calendar years are shorter than Gregorian years and the current year number is lower, the year numbers of the two calendar systems will coincide on May 1, 20874 CE/AH.
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What is one of the world's most accurate calendar systems?
The Gregorian calendar deviates from the solar year by 1 day in 3236 years.
The Solar Hijri calendar, also known as Persian Calendar, Iranian Calendar, and SH Calendar, used in ๐ฎ๐ทIran and ๐ฆ๐ซAfghanistan, is more accurate.
A year in this observational calendar has 12 months. The first 6 months have 31 days, and months 7 through 11 have 30 days. The last month, Esfand, has 29 days in a common year and 30 days in a leap year.
One of complex mathematical rules that determine the distribution of leap years in it achieves a degree of accuracy very similar to that of the observational version, requiring about 110,000 years to accumulate an error of 1 day.
Its first version, the Jalali calendar, was developed in the 11th century by astronomers including the Persian scientist Omar Khayyam.
Although the Solar Hijri calendar shares this start date with the Islamic Hijri calendar, the calendar systems are not related otherwise.
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The Gregorian calendar deviates from the solar year by 1 day in 3236 years.
The Solar Hijri calendar, also known as Persian Calendar, Iranian Calendar, and SH Calendar, used in ๐ฎ๐ทIran and ๐ฆ๐ซAfghanistan, is more accurate.
A year in this observational calendar has 12 months. The first 6 months have 31 days, and months 7 through 11 have 30 days. The last month, Esfand, has 29 days in a common year and 30 days in a leap year.
One of complex mathematical rules that determine the distribution of leap years in it achieves a degree of accuracy very similar to that of the observational version, requiring about 110,000 years to accumulate an error of 1 day.
Its first version, the Jalali calendar, was developed in the 11th century by astronomers including the Persian scientist Omar Khayyam.
Although the Solar Hijri calendar shares this start date with the Islamic Hijri calendar, the calendar systems are not related otherwise.
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What calendars have 13 months?
Two traditional calendars of Africa have 13 months.
The Coptic calendar, also called the Alexandrian calendar, help orthodox Copts worldwide to determine the dates of religious holidays and rituals. It derived from the ancient Egyptian calendar and is still officially used in ๐ช๐ฌEgypt.
It is divided into 13 months. The first 12 months have 30 days. The last month, called Pi Kogi Enavot or Nasie and referred to as an epagomenal month, has 5 days in a common year and 6 days in a leap year.
Year 1 in the Coptic c. started on August 29, 284 in the Julian c.
It is one the oldest calendar system still in use.
The Ethiopian calendar has the same system of the calculation of 13 months as the Coptic calendar.
The main difference is the calculation of the date of the birth of Jesus - the Ethiopian c. is 7 to 8 years behind the Gregorian c.
The main calendar in ๐ช๐นEthiopia, it is also used by the Orthodox Tewahido Church in ๐ช๐ทEritrea.
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Two traditional calendars of Africa have 13 months.
The Coptic calendar, also called the Alexandrian calendar, help orthodox Copts worldwide to determine the dates of religious holidays and rituals. It derived from the ancient Egyptian calendar and is still officially used in ๐ช๐ฌEgypt.
It is divided into 13 months. The first 12 months have 30 days. The last month, called Pi Kogi Enavot or Nasie and referred to as an epagomenal month, has 5 days in a common year and 6 days in a leap year.
Year 1 in the Coptic c. started on August 29, 284 in the Julian c.
It is one the oldest calendar system still in use.
The Ethiopian calendar has the same system of the calculation of 13 months as the Coptic calendar.
The main difference is the calculation of the date of the birth of Jesus - the Ethiopian c. is 7 to 8 years behind the Gregorian c.
The main calendar in ๐ช๐นEthiopia, it is also used by the Orthodox Tewahido Church in ๐ช๐ทEritrea.
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What is a calendar that consists of three separate calendars?
it is the Mayan Calendar, that consists of three separate corresponding calendars: the Long Count, the Tzolkin (divine calendar), and the Haab (civil calendar). Each of them is cyclical, meaning that a certain number of days must occur before a new cycle can begin.
Being used simultaneously,
๐the Tzolkin and the Haab identify the days, but not the years
๐the Long Count date comes first, then the Tzolkin date, and last the Haab date.
A typical Mayan date would read: 13.0.0.0.0 4 Ahau 8 Kumku.
A date is specified by its position in both the Tzolkin and the Haab calendars. This creates a total of 18,980 unique date combinations, which are used to identify each day within a cycle lasting about 52 years. This period is called the Calendar Round.
The Mayan c. is still in use in some Mayan communities. It dates back to the 5th century BCE, but the same system was also used by other indigenous peoples of America.
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it is the Mayan Calendar, that consists of three separate corresponding calendars: the Long Count, the Tzolkin (divine calendar), and the Haab (civil calendar). Each of them is cyclical, meaning that a certain number of days must occur before a new cycle can begin.
Being used simultaneously,
๐the Tzolkin and the Haab identify the days, but not the years
๐the Long Count date comes first, then the Tzolkin date, and last the Haab date.
A typical Mayan date would read: 13.0.0.0.0 4 Ahau 8 Kumku.
A date is specified by its position in both the Tzolkin and the Haab calendars. This creates a total of 18,980 unique date combinations, which are used to identify each day within a cycle lasting about 52 years. This period is called the Calendar Round.
The Mayan c. is still in use in some Mayan communities. It dates back to the 5th century BCE, but the same system was also used by other indigenous peoples of America.
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Ask Me
What is calendar? A calendar is a system of organizing days for social, religious, commercial, or administrative purposes. This is done by giving names to periods of time, typically days, weeks, months, and years. A date is the designation of a singleโฆ
What are the types of calendars?
The motion (or apparent motion) of the Sun and the Moon provide temporal cycles which have strongly influenced the design of most calendars.
Most calendars usually attempt to accord either with the solar cycle (the cycle of the seasons) or with the lunar cycle (the cycle of the phases of the Moon) or with both.
There are over forty calendars currently in use, and many others that have been used or have been invented.
Calendars thus come in many forms and, according to specialists, may be divided into five kinds:
1๏ธโฃ Purely lunar calendars
Those which are based on the natural cycles of the Moon, which have months which attempt to stay as closely as possible in sync with the lunar phases, and whose years (composed of months) have no close relation with the solar cycle. A good example of this type is the Muslim Calendar.
2๏ธโฃ Purely solar calendars
Those which are based on the cycle of the seasons, which results from the motion of the Earth around the Sun (and the fact that the Earth's axis of rotation is tilted significantly with respect to the Earth's plane of rotation about the Sun). These calendars have years, which accord with the seasonal cycle and begin at or near a fixed point in that cycle (for example, the vernal equinox). Years in a purely solar calendar may be composed of months, but the months have little if any connection with the lunar cycle, for example, the the Gregorian Calendar (Common Era Calendar with years designated according to the astronomical system) commonly in use today.
3๏ธโฃ Lunisolar calendars and Solilunar calendars
These calendars aim to be both solar calendars and lunar calendars.
Lunisolar calendars are more successful in tracking the seasonal cycle than the lunar cycle. Such a calendar consists of years which accord closely with the seasonal cycle and months which accord more-or-less closely with the lunar cycle. An example of a lunisolar calendar is the Hindu calendar.
Solilunar calendars are more successful in tracking the lunar cycle than the seasonal cycle. They consist of months which accord closely with the lunar cycle and years which accord more-or-less closely with the seasonal cycle, for example, the Chinese Calendar or the Hebrew Calendar.
Usually solilunar calendars and lunisolar calendars are regarded as forming a single class: 'lunisolar calendars'.
4๏ธโฃ Lunistellar calendars
Some experts suggested that a classification of calendars should also include the category of 'lunistellar'. The Egyptian Calendar is considered to be such a calendar.
5๏ธโฃ Other calendars
Some calendars apparently make little or no attempt to accord with the cycles of the Moon or of the Sun. For example, the Tzolkin and the Long Count in the Maya Calendar. Some of these calendars may accord with other astronomical cycles, such as that associated with the planet Venus.
The motion (or apparent motion) of the Sun and the Moon provide temporal cycles which have strongly influenced the design of most calendars.
Most calendars usually attempt to accord either with the solar cycle (the cycle of the seasons) or with the lunar cycle (the cycle of the phases of the Moon) or with both.
There are over forty calendars currently in use, and many others that have been used or have been invented.
Calendars thus come in many forms and, according to specialists, may be divided into five kinds:
1๏ธโฃ Purely lunar calendars
Those which are based on the natural cycles of the Moon, which have months which attempt to stay as closely as possible in sync with the lunar phases, and whose years (composed of months) have no close relation with the solar cycle. A good example of this type is the Muslim Calendar.
2๏ธโฃ Purely solar calendars
Those which are based on the cycle of the seasons, which results from the motion of the Earth around the Sun (and the fact that the Earth's axis of rotation is tilted significantly with respect to the Earth's plane of rotation about the Sun). These calendars have years, which accord with the seasonal cycle and begin at or near a fixed point in that cycle (for example, the vernal equinox). Years in a purely solar calendar may be composed of months, but the months have little if any connection with the lunar cycle, for example, the the Gregorian Calendar (Common Era Calendar with years designated according to the astronomical system) commonly in use today.
3๏ธโฃ Lunisolar calendars and Solilunar calendars
These calendars aim to be both solar calendars and lunar calendars.
Lunisolar calendars are more successful in tracking the seasonal cycle than the lunar cycle. Such a calendar consists of years which accord closely with the seasonal cycle and months which accord more-or-less closely with the lunar cycle. An example of a lunisolar calendar is the Hindu calendar.
Solilunar calendars are more successful in tracking the lunar cycle than the seasonal cycle. They consist of months which accord closely with the lunar cycle and years which accord more-or-less closely with the seasonal cycle, for example, the Chinese Calendar or the Hebrew Calendar.
Usually solilunar calendars and lunisolar calendars are regarded as forming a single class: 'lunisolar calendars'.
4๏ธโฃ Lunistellar calendars
Some experts suggested that a classification of calendars should also include the category of 'lunistellar'. The Egyptian Calendar is considered to be such a calendar.
5๏ธโฃ Other calendars
Some calendars apparently make little or no attempt to accord with the cycles of the Moon or of the Sun. For example, the Tzolkin and the Long Count in the Maya Calendar. Some of these calendars may accord with other astronomical cycles, such as that associated with the planet Venus.
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What is Origami?
Origami art is the traditional Japanese craft of folding a sheet of paper into objects and figures. Ori translates as โfoldedโ and kami means โpaperโ.
Paper was introduced to Japan in the 6th century. At that time, the practice of paper folding emerged as a ceremonial Shinto ritual. It was not until Japan's Edo Period (1603 โ 1868) that origami also became a leisurely activity and an art form.
Any paper, of any size, can be used for making origami. The origami sheets are typically prepackaged and sold in 6- or 7-inch (15.5- or 17.8-cm) squares. As a rule, each sheet is colored or decoratively patterned on one side and solid white on the other. Sometimes, this contrast is critical to a folded figureโs design.
Of the thousands of recorded sculptural art forms made by folding paper, as much as 95% of them start as a perfect square.
The iconic figure of origami paper art is the bird, and the undisputed masterpiece is the flying crane.
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Origami art is the traditional Japanese craft of folding a sheet of paper into objects and figures. Ori translates as โfoldedโ and kami means โpaperโ.
Paper was introduced to Japan in the 6th century. At that time, the practice of paper folding emerged as a ceremonial Shinto ritual. It was not until Japan's Edo Period (1603 โ 1868) that origami also became a leisurely activity and an art form.
Any paper, of any size, can be used for making origami. The origami sheets are typically prepackaged and sold in 6- or 7-inch (15.5- or 17.8-cm) squares. As a rule, each sheet is colored or decoratively patterned on one side and solid white on the other. Sometimes, this contrast is critical to a folded figureโs design.
Of the thousands of recorded sculptural art forms made by folding paper, as much as 95% of them start as a perfect square.
The iconic figure of origami paper art is the bird, and the undisputed masterpiece is the flying crane.
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What are 6 innovations inspired by origami?
Origami might seem like an unlikely source of inspiration for scientists and engineers, yet its intricate folding patterns are behind six following innovations.
1๏ธโฃDeep-sea grabber that helps scientists to catch delicate deep-sea creatures โฌ๏ธ
2๏ธโฃ Bulletproof shield that can be folded into a shape that fits easily into the trunk of a car and protect law enforcement from gunfire โฌ๏ธ
3๏ธโฃ Planetary explorer with wheels designed to fold up tight for spaceflight and then swing back into place when the spacecraft reaches its destination โฌ๏ธ
4๏ธโฃ Tiny ingestible robots that fold small enough to fit in a pill โฌ๏ธ
5๏ธโฃ Star shade that could fold up during launch and then unfurl in space before being positioned in front of a telescope to block starlight and permit detailed observations of exoplanets โฌ๏ธ
6๏ธโฃ Artificial muscles that are made of folded โskeletonsโ encased within fluid-filled sacs and that could power safe for humans โsoftโ robots โฌ๏ธ
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Origami might seem like an unlikely source of inspiration for scientists and engineers, yet its intricate folding patterns are behind six following innovations.
1๏ธโฃDeep-sea grabber that helps scientists to catch delicate deep-sea creatures โฌ๏ธ
2๏ธโฃ Bulletproof shield that can be folded into a shape that fits easily into the trunk of a car and protect law enforcement from gunfire โฌ๏ธ
3๏ธโฃ Planetary explorer with wheels designed to fold up tight for spaceflight and then swing back into place when the spacecraft reaches its destination โฌ๏ธ
4๏ธโฃ Tiny ingestible robots that fold small enough to fit in a pill โฌ๏ธ
5๏ธโฃ Star shade that could fold up during launch and then unfurl in space before being positioned in front of a telescope to block starlight and permit detailed observations of exoplanets โฌ๏ธ
6๏ธโฃ Artificial muscles that are made of folded โskeletonsโ encased within fluid-filled sacs and that could power safe for humans โsoftโ robots โฌ๏ธ
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What are three laws of motion?
Sir Isaac Newton's three laws of motion describe the motion of massive bodies and how they interact.
Presented in 1686, these three laws are:
1๏ธโฃ Objects in motion or at rest remain in the same state unless an external force imposes change. It is the concept of inertia.
2๏ธโฃ The force acting on an object is equal to the mass of the object multiplied by its acceleration. In other words, you can calculate how much force it takes to move objects with various masses at different speeds.
In mathematical form it is F = ma, where F is force, m is mass, and a is acceleration. The bold letters indicate that force and acceleration are vector quantities โ they have both magnitude and direction.
3๏ธโฃ For every action, there is an equal and opposite reaction.
They formed the basis for our understanding of mechanics and gravity and in Newtonโs time were considered revolutionary.
The thing that couldโt be explained by these laws is light.
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Sir Isaac Newton's three laws of motion describe the motion of massive bodies and how they interact.
Presented in 1686, these three laws are:
1๏ธโฃ Objects in motion or at rest remain in the same state unless an external force imposes change. It is the concept of inertia.
2๏ธโฃ The force acting on an object is equal to the mass of the object multiplied by its acceleration. In other words, you can calculate how much force it takes to move objects with various masses at different speeds.
In mathematical form it is F = ma, where F is force, m is mass, and a is acceleration. The bold letters indicate that force and acceleration are vector quantities โ they have both magnitude and direction.
3๏ธโฃ For every action, there is an equal and opposite reaction.
They formed the basis for our understanding of mechanics and gravity and in Newtonโs time were considered revolutionary.
The thing that couldโt be explained by these laws is light.
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โค26๐21๐ฅฐ1๐1๐1
What is the Theory of relativity?
As a scientific notion, the Theory of relativity states that space and time are relative, and all motion must be relative to a frame of reference.
It was formulated by Albert Einstein, who sought to explain situations in which Newtonian physics fail to deal successfully with some phenomena, and in doing so proposed revolutionary changes in human concepts of time, space and gravity.
In fact it encompasses 2๏ธโฃ theories:
โ๏ธSpecial Relativity Theory, dealing with the structure of space-time
and
โ๏ธ General Relativity Theory, stating that objects at rest in the gravitational field and accelerating are identical physically.
Study of relativity led to the emergence of one of the greatest formulas E = mc2, where E is Energy, m stands for mass and c for the velocity of light. This equation answers why the objectโs mass increases with its velocity- something many scientists before Einstein had failed to explain.
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As a scientific notion, the Theory of relativity states that space and time are relative, and all motion must be relative to a frame of reference.
It was formulated by Albert Einstein, who sought to explain situations in which Newtonian physics fail to deal successfully with some phenomena, and in doing so proposed revolutionary changes in human concepts of time, space and gravity.
In fact it encompasses 2๏ธโฃ theories:
โ๏ธSpecial Relativity Theory, dealing with the structure of space-time
and
โ๏ธ General Relativity Theory, stating that objects at rest in the gravitational field and accelerating are identical physically.
Study of relativity led to the emergence of one of the greatest formulas E = mc2, where E is Energy, m stands for mass and c for the velocity of light. This equation answers why the objectโs mass increases with its velocity- something many scientists before Einstein had failed to explain.
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๐46โค7๐4๐ฅฐ2๐1
Is time travel possible?
For most people โtime travelโ means traveling faster than 1 second per second.
Real-life time travel occurs through time dilation, a property of Einsteinโs special relativity.
The faster you travel, the slower you experience time.
โฑโ๏ธโฑScientists have shown that this theory is true. They used two clocks set to the exact same time. One clock stayed on Earth, while the other flew in an airplane going in the same direction Earth rotates. After the airplane flew around the world, scientists compared the two clocks. The clock on the fast-moving airplane was slightly behind the clock on the ground. So, the clock on the airplane was traveling slightly slower in time than 1 second per second.
In order to send a traveller years into the future, we would either have to take advantage of the intense gravitational acceleration caused by black holes or send the traveller rocketing into space at close to the speed of light (about 1 billion km/h).
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For most people โtime travelโ means traveling faster than 1 second per second.
Real-life time travel occurs through time dilation, a property of Einsteinโs special relativity.
The faster you travel, the slower you experience time.
โฑโ๏ธโฑScientists have shown that this theory is true. They used two clocks set to the exact same time. One clock stayed on Earth, while the other flew in an airplane going in the same direction Earth rotates. After the airplane flew around the world, scientists compared the two clocks. The clock on the fast-moving airplane was slightly behind the clock on the ground. So, the clock on the airplane was traveling slightly slower in time than 1 second per second.
In order to send a traveller years into the future, we would either have to take advantage of the intense gravitational acceleration caused by black holes or send the traveller rocketing into space at close to the speed of light (about 1 billion km/h).
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