Sun-Earth Astronomy

Sun-Earth Astronomy:

The earth revolves around the sun in a plane called ecliptic plane. The earth’s axis is inclined at 23.45 (constant in time) with respect to the normal to the ecliptic plane. The same then holds for the angle between the earth’s equatorial plane and the ecliptic plane.The varying solar influence can be described by the angle between the earth’s equatorial plane and the plane of its revolution around the sun. This angle is called the solar declination . Its maximum daily change is less than 0.5.