Write a short note on Astronomical units .
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Answers
Answer:
The astronomical unit (symbol: au, or AU) is a unit of length, roughly the distance from Earth to the Sun and equal to about 150 million kilometres (93 million miles). ... The AU was originally conceived as the average of Earth's aphelion and perihelion; however, since 2012 it has been defined as exactly 149597870700 m.
Answer:
Definition
Astronomical unit (AU) represents the mean distance between the Earth and our sun.
Distance
An AU is approximately 93 million miles (150 million km). It’s approximately 8 light-minutes.
More exactly, one astronomical unit (AU) = 92,955,807 miles (149,597,871 km).
About Astronomical units
Earth’s orbit around the sun isn’t a perfect circle. So Earth’s distance from the sun changes throughout the year. Astronomers give the Earth’s changing distance throughout the year relative to the astronomical unit, too. For instance, when the Earth is at perihelion – its nearest point to the sun for the year, in January – it’s about 0.983 AU from the sun. When our planet swings out to aphelion – its farthest point, in July – we’re about 1.017 AU away from the sun.