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Every 18.6 years, the angle between the Moon's orbit and Earth's equator reaches a maximum of 28°36′, the sum of Earth's equatorial tilt (23°27′) and the Moon's orbital inclination (5°09′) to the ecliptic. This is called major lunar standstill. Around this time, the Moon's declination will vary from −28°36′ to +28°36 ...
Pluto's origin and identity had long puzzled astronomers. One early hypothesis was that Pluto was an escaped moon of Neptune [161] knocked out of orbit by Neptune's largest moon, Triton. This idea was eventually rejected after dynamical studies showed it to be impossible because Pluto never approaches Neptune in its orbit. [162]
[4] [5] Earth was never formally 'discovered' because it was never an unrecognized entity by humans. However, its shared identity with other bodies as a "planet" is a historically recent discovery. The Earth's position in the Solar System was correctly described in the heliocentric model proposed by Aristarchus of Samos. [6] Moon: Earth I
The body must orbit its host star, just as Earth and Jupiter orbit the sun. It is large enough to be mostly round. It must have an important influence on the orbital stability of the other objects ...
Charon and Earth’s moon are both a large fraction of the size of the main body they orbit, which is unlike other smaller moons orbiting planets throughout our solar system. (Pluto has four ...
Neptune's innermost moon, Naiad, is in a 73:69 fourth-order resonance with the next outward moon, Thalassa. As it orbits Neptune, the more inclined Naiad successively passes Thalassa twice from above and then twice from below, in a cycle that repeats every ~21.5 Earth days. The two moons are about 3540 km apart when they pass each other.
2011 – Dawn spacecraft enters orbit around the large asteroid Vesta making detailed measurements. [240] 2012 – Saturn's moon Methone is imaged up close by the Cassini spacecraft, revealing a remarkably smooth surface. [241] 2012 – Dawn spacecraft breaks orbit of Vesta and heads for Ceres. [240]
Five planets are going to be retrograde in the summer of 2024. Here are the dates for Mercury retrograde, Venus retrograde, Saturn retrograde, Neptune retrograde, Pluto retrograde and more.