What is the difference between a retrograde and a prograde orbit?
A retrograde orbit is an orbit in which a satellite or celestial body moves in the opposite direction of the rotation of the planet it orbits. In other words, the satellite is moving against the direction of the planet's rotation.
A prograde orbit, on the other hand, is an orbit in which a satellite or celestial body moves in the same direction as the planet's rotation. The satellite is moving in the direction of the planet's rotation.
The terms 'retrograde' and 'prograde' are used to describe the motion of an object relative to a reference point, which is usually the rotation of the planet it orbits. Retrograde motion is less common in the solar system and occurs when a satellite or celestial body is captured into orbit at an angle that is opposite to the planet's direction of rotation.
Examples of retrograde orbit include the moons of Neptune, such as Triton, which orbits in the opposite direction of Neptune's rotation. Examples of prograde orbits include Earth's moon and the majority of the planets in our solar system.
Understanding the difference between retrograde and prograde orbits is important in studying the motion and behavior of objects in the solar system, and can help astronomers to predict and explain phenomena such as eclipses, transits, and conjunctions.
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