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The term retrograde is from the Latin word retrogradus – "backward-step", the affix retro-meaning "backwards" and gradus "step". Retrograde is most commonly an adjective used to describe the path of a planet as it travels through the night sky, with respect to the zodiac, stars, and other bodies of the celestial canopy. In this context, the ...
Six of the planets also rotate about their axis in this same direction. The exceptions – the planets with retrograde rotation – are Venus and Uranus. Venus's axial tilt is 177°, which means it is rotating almost exactly in the opposite direction to its orbit. Uranus has an axial tilt of 97.77°, so its axis of rotation is approximately ...
Most languages today use some variant of the name "Neptune" for the planet. In Chinese, Vietnamese, Japanese, and Korean, the planet's name was translated as "sea king star" ( 海王星 ). [ 55 ] [ 56 ] In Mongolian , Neptune is called Dalain van ( Далайн ван ), reflecting its namesake god's role as the ruler of the sea.
No, Mercury isn't the only planet that goes retrograde.
It is the only moon of Neptune massive enough to be rounded under its own gravity and hosts a thin, hazy atmosphere. Triton orbits Neptune in a retrograde orbit—revolving in the opposite direction to the parent planet's rotation—the only large moon in the Solar System to do so.
The term does not refer to shape; Triton, for example, is a round moon but is considered irregular due to its orbit and origins. As of February 2024, 228 irregular moons are known, orbiting all four of the outer planets (Jupiter, Saturn, Uranus, and Neptune).
Astronomers have used telescope data to color-correct Voyager 2 images of Neptune and Uranus, revealing that the planets have a similar greenish blue hue. Color-corrected images reveal accurate ...
from Latin periodus (“complete sentence, period, circuit”), from Ancient Greek períodos (“cycle, period of time”) farer: ion: from Greek neuter present participle of ienai, meaning "to go". samestead: isotope: Greek roots isos (ἴσος "equal") and topos (τόπος "place"), meaning "the same place"