Earth’s Rotation Speed and Revolution

Earth’s Rotation Speed and Revolution
Earth’s Rotation and Revolution


  • Earth always rotates from west to east on a certain axis. This motion of the Earth is called rotation or rotation speed.
  • There is a day when the Earth takes a full circle at its own pace. This speed is also called daily movement.
  • The axis or axis on which the Earth rotates is an imaginary line that joins the northern and southern poles through the center of the Earth. This axis of the Earth forms 66 ° degrees along the plane of its orbit. This axis of the Earth is always tilted on one side only.
  • The axis of the earth between the passing of a certain axis successively above a mid-line always tilts on the same side. The length of a nakshatra day is 23 hours, 56 minutes, and 4.09 seconds.
  • The period of a day when it is calculated based on the time taken between two successive passes of the mid-day sun above a certain mid-day line, is called a solar day. The average length of a solar day is 24 hours. Solar day is 3 minutes and 56 seconds bigger than Nakshatra day.
  • Their mass should be so that they are almost round in shape due to their gravity to avoid the influence of outer planets.
  • They do not encroach other planetary orbits. Pluto’s orbit is bent compared to other planets and transcends Arun’s orbit.

Some definitions related to Earth and Solar System

  • Daily Motion – A rotation on the Earth by its axis which is one day.
  • Annual Speed ​​- An orbit by Earth towards the Sun in its orbit, in which it takes 365¼ days.
  • Nakshatra Day – The period between successively passing a certain line twice over a mid-line.
  • Solar Day – The period between the successive twilight of the mid-sun passing above a certain mid-line.
  • Upasour- The position of the distance from the Sun at its highest in the elliptical orbit by the Earth in the order of the orbiting period of the Sun, which occurs on 4 July.
  • Cancer solstice – The position of the Sun by the Earth on December 22, when the sun shines vertically on the Capricorn line.
  • Equinox – The conditions of 21 March and 23 September when the sun shines vertically at the equator, due to which the two hemispheres are equal day and night everywhere. The state of March 21 is called the spring equinox and the state of September 23 is called the state of the autumn equinox.
  • Sijgi- A linear position of the Sun, Moon and Earth.
  • Vi-uti – The position of the Moon between the Sun and the Earth, due to which the lunar eclipse occurs.
  • Yuti – The position of the Moon between the Sun and the Earth, due to which the solar eclipse occurs.
  • Due to the rotation of the earth, every part of the earth turns to face the sun in turn, so the day facing the sun is in the front and the night in the back part, thus the day-night sequence is the result of the rotation of the earth. is.
  • Thus, a day of 24 hours comes into existence due to the rotation speed of the Earth.
  • Latitude and longitude are determined on the basis of the axis of rotation.
  • Due to this, both physical and biological activity on earth is affected.
  • The Coriolis force is generated, due to which water and winds in the northern hemisphere turn to their right and in the southern hemisphere to their left.
  • Tides occur in the oceans.


The path of the Earth Kim orbit is oval. Therefore, the distance between the Earth and the Sun does not remain the same throughout the year. In January, it is closest to the Sun. At this time the distance between the Earth and the Sun is 6 million km. it occurs. This state of the earth is called Upasour. In July, the Earth is relatively far away from the Sun. At this time the distance between Sun and Earth is 520 lakh km. She lives. Therefore, this state of the Earth is called Apsaur. The condition of Apsour occurs on 4 July. The following effects of the Earth’s rotation speed can be seen-

  • The sun’s rays shine straight and obliquely
  • Determination of the duration of the year
  • Determination of Cancer and Capricorn Lines
  • 6-6 month days and nights at the poles
  • Variation in heat distribution on the ground
  • Determination of climate restrictions
  • Grow small day and night

Season change

Day and night are always equal at the equator, because the equator always divides the equator into two equal parts, but since the Earth tilts 23½ ° on its axis and always tilts to one side, the equator is Apart from dividing all the latitude lines of the northern and southern hemispheres into two equal parts, the light circle divides unevenly into different seasons. As a result, the day-night period is not the same in the remaining parts of the equator.
On the basis of the above description, in short, the reason of day and night growing up is small.

  1. The annual movement of the Earth.
  2. The axis of the Earth always tilts to 66½ °.
  3. Always bending the earth’s axis on one side.
  4. There are 4 main states in the rotation of the earth and the seasons change in these four states.
  • The axis of the Earth forms a length of 23½ ° from its perpendicular plane.
  • When the sun shines perpendicular to the Tropic of Cancer. At this time, the sun has the highest elevation in the northern hemisphere, making the days here larger and nights shorter. Hence there is summer season in the northern hemisphere, this situation occurs on June 21 and this condition is called Cancer solstice or summer solstice.
  • On the 22nd of December, the South Pole faces the Sun and the Sun shines on the Tropic of Capricorn, causing summer here. This condition is called Makar Sankranti or Cold Solstice. At this time, the sun shines in the northern hemisphere diagonally, making the days shorter and nights larger, and the winters are reduced by winter.
  • In the conditions of 21 March and 23 September, the sun shines at the equator. \ At this time half of all latitude lines remain in light, which makes day and night equal. Due to the similarity of day, night and season in both the hemispheres, both these conditions are called equinox or samrat day. The spring state of March 21 is called the autumn equinox stage.

Thus, there are different reasons for change of seasons.
Tilt of the earth’s axis
Always bending on one side of the earth’s axis
Rotation of the earth
As a result of these three, day and night grow smaller and smaller.

Moon phases

Rising moon
Receding moon
A linear position of the Sun, Moon and Earth is called Sijgi, which is in two ways-
Sun – Moon – Earth – Yuti
Sun – Earth – Moon – Viyuti

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