Tag: our solar system

Earth spins about its own axis from west to east. In another word earth turns counter clockwise direction as viewed from north pole.

On Astronomical unit is the mean distance between earth and sun.

As earth is rotating on its own axis so its half part is exposed to sun cause day at that part and hidden half part suffers from darkness called night.

As earth is rotating on its own axis from west to east so, due to relative motion star appears to move from east to west.

Ans : Venus

Planets that rotate rapidly experience a centrifugal force that causes them to bulge at the equator and flatten at the poles. Jupiter has a very fast rotation period, leading to this oblate shape.

Neptune takes maximum time to complete one revolution as it is the farthest planet.

Ans: Elliptical 

Solar day is the time taken by earth to complete one rotation about its axis with respect to sun. Sidereal day is the time taken by earth to complete one rotation about its axis with respect to distant star. There is a difference of $4$ minutes between solar day and sidereal day. Solar day is longer as earth has to rotate greater angle to attain same position with respect to sun due to its own motion (revolution) round the sun. Its position with respect to distant star remains almost fixed.

A pole star is a visible star, which lies approximately directly overhead when viewed from earth's north pole or south pole. In practice the term pole star usually refers to polars, which is the current northern pole star, also known as north star. The south celestial pole lacks a bright star like polarise to mark its position.