Prograde and retrograde motion - Retrogradation or apparent retrograde motion

Prograde motion is the rotational or orbital motion of a body in a direction similar to that of other bodies within a given system, and is sometimes called direct motion. Retrograde motion is in the contrary direction. The word 'retrograde' derives from the Latin words retro, backwards, and gradus, step. Prograde and retrograde motion - Two notations. The north orbital pole of a celestial body is defined by the right-hand rule: If you curve the fingers of your right hand a ...

Including:

• Prograde and retrograde motion - Two notations
• Prograde and retrograde motion - Retrograde orbits
• Prograde and retrograde motion - Retrograde rotation
• Prograde and retrograde motion - Retrogradation or apparent retrograde motion
• Prograde and retrograde motion - Examples
• Prograde and retrograde motion - Reference

Read more here: » Prograde and retrograde motion: Encyclopedia - Prograde and retrograde motion

Retrograde motion should not be confused with retrogradation. The latter term is used in reference to the motion of the outer planets (Mars, Jupiter, Saturn, Neptune, Uranus, and Pluto). Though these planets appear to move from east to west on a nightly basis in response to the spin of Earth, they are most of the time drifting slowly eastward with respect to the background of stars, which can be observed by noting the position of these planets for several nights in a row. This motion is normal for these planets, so it is called dir ...

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Prograde and retrograde motion, Prograde and retrograde motion - Two notations, Prograde and retrograde motion - Retrograde orbits, Prograde and retrograde motion - Retrograde rotation, Prograde and retrograde motion - Retrogradation or apparent retrograde motion, Prograde and retrograde motion - Examples, Prograde and retrograde motion - Reference

Read more here: » Prograde and retrograde motion: Encyclopedia II - Prograde and retrograde motion - Retrogradation or apparent retrograde motion

Most planets, including Earth, spin in the prograde sense: They spin in the same direction as they orbit the Sun (that is, their north rotational pole and north orbital pole point in similar directions, more or less in the direction of the Solar north pole). The exceptions are Venus, Uranus, and Pluto. Uranus rotates nearly on its side relative to its orbit. It has been described as having an axial tilt of 82° and a negative rotation of −17 hours, or, equivalently, of having an axis tilted at 98° and a positive rotation. Since current sp ...

See also:

Prograde and retrograde motion, Prograde and retrograde motion - Two notations, Prograde and retrograde motion - Retrograde orbits, Prograde and retrograde motion - Retrograde rotation, Prograde and retrograde motion - Retrogradation or apparent retrograde motion, Prograde and retrograde motion - Examples, Prograde and retrograde motion - Reference

Read more here: » Prograde and retrograde motion: Encyclopedia II - Prograde and retrograde motion - Retrograde rotation

The north orbital pole of a celestial body is defined by the right-hand rule: If you curve the fingers of your right hand along the direction of orbital motion, with your thumb extended parallel to the orbital axis, the direction your thumb points is defined to be north. Similarly, the north rotational pole of a body is defined by the direction of your thumb if you were to wrap your fingers around its equator in the direction it spins. There are two notations for retrograde motion that are mathematically equivalen ...

See also:

Prograde and retrograde motion, Prograde and retrograde motion - Two notations, Prograde and retrograde motion - Retrograde orbits, Prograde and retrograde motion - Retrograde rotation, Prograde and retrograde motion - Retrogradation or apparent retrograde motion, Prograde and retrograde motion - Examples, Prograde and retrograde motion - Reference

Read more here: » Prograde and retrograde motion: Encyclopedia II - Prograde and retrograde motion - Two notations