Tag: solar system and sun

The mean distance between the Earth and Sun as well as the distances within the solar system is represented by astronomical units.
One astronomical unit (AU) represents:
1 AU = 149,597,870.700 kilometers (or 149,597,870,700 meters)
An astronomical unit is the mean distance between the Earth and the Sun.

Out of these fours mercury takes minimum time to revolute one round. It takes $88$ days to do so.

Day and night are caused by  rotation of earth.

Every planet in solar system except venus and uranus rotates frm west to east so uranus rotates from east to west.

A unique feature of Uranus is that it appears to roll along its orbital plane. This is because it has a highly tilted axis which makes it almost parallel to its orbital motion and the planet appears to roll.

Jupiter is the fastest rotating planet. It take only 9 hours and 55 min to complete one rotation about its own axis.

From summer solstice (June 21), the Sun starts moving towards the South and from winter solstice (December 22), the Sun starts moving towards North. So during summer solstice, it is in the south eastern part and in winter solstice it is in the north eastern part. However, there are 2 days, i.e., March 21 and September 23, when the Sun rises exactly in the East.

With the development of the heliocentric model by Nicolaus Copernicus in the 16th century, the sun was believed to be the center of the Universe, with the planets (including Earth) and stars orbiting it. 

Every planet is at a different distance from the Sun and has a fixed orbit in which it revolves around the Sun. The Sun"s gravitational force holds the planets in this place and they do not collide with each other as their orbits are non-intersecting.