EARTH ALL ABOUT, measurement and other information
Our mother “Earth” is also called “Blue Planet” . It is the densest of all planets. it spins its axis from west to east in23 hrs,56min and 40 sec.It has the rotational velocity at equator is 1667 km/h and it decreases towards the poles , where it is zero. For this rotation- days and nights come in every 24 hours, the change in the direction of wind and ocean currents also the result of rotation. It also causes rise and fall of tides happen everyday. The rotation of earth is two types, 1. Rotation of daily movement, 2. Revolution or annual movement. The longest day in North Hemisphere is June21, while shortest day is on 22 December, but days and nights are equal at the equator. When we talk about Earth’s revolution then it takes 365 days, 5 hrs, 48 min to complete a revolution. Thus it results one extra day in every four year.
Revolution of the planet results in ,1. Change of season, 2. Variation in the lengths of days and night at different times of the year, 3. Shifting in wind belts, 4. Determination of latitudes.
The axis of this planet remains inclined at an angle of 66 1/20 to the plain of the earth’s orbit and is tilted 23 1/2 0 from a line perpendicular to this plane. The circumference of the earth is around 40232 km , area 510 million sqm and the average distance from the Sun is 149 million km.
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