SOLAR SYSTEM

Detailed explanation-1: -Explanation: The direction of satellite rotation may be either in the same direction as the earth’s rotation or against the direction of earth’s rotation. In the former case, the orbit is said to be posigrade, and in the latter case, retrograde. Most orbits are posigrade.

Detailed explanation-2: -The direction a spacecraft or other body travels in orbit can be direct, or prograde, in which the spacecraft moves in the same direction as the planet rotates, or retrograde, going in a direction opposite the planet’s rotation.

Detailed explanation-3: -Prograde Orbit: an orbit in which satellite moves in the same direction as the Earth‟s rotation. Its inclination is always between 00 to 900.

Detailed explanation-4: -Retrograde motion in astronomy is, in general, orbital or rotational motion of an object in the direction opposite the rotation of its primary, that is, the central object (right figure). It may also describe other motions such as precession or nutation of an object’s rotational axis.

Detailed explanation-5: -A geostationary satellite travels from west to east over the equator. It moves in the same direction and at the same rate Earth is spinning.

Detailed explanation-6: -Perigee: A point for a satellite closest from the Earth. It is denoted as hp. Line of Apsides: Line joining perigee and apogee through centre of the Earth. It is the major axis of the orbit.

Detailed explanation-7: -A: Satellites and other spacecraft can orbit with the rotation of the Earth, in the opposite direction of Earth’s rotation, or in any other direction! Usually satellites orbit in the direction of Earth’s rotation, but there are some satellites that travel in the opposite direction.