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2. Venus - Wikipedia

   en.wikipedia.org/wiki/Venus

   Because of the retrograde rotation, the length of a solar day on Venus is significantly shorter than the sidereal day, at 116.75 Earth days (making the Venusian solar day shorter than Mercury's 176 Earth days — the 116-day figure is close to the average number of days it takes Mercury to slip underneath the Earth in its orbit [the number of ...

3. Sidereal time - Wikipedia

   en.wikipedia.org/wiki/Sidereal_time

   Mercury's sidereal day is about two-thirds of its orbital period, so by the prograde formula its solar day lasts for two revolutions around the Sun – three times as long as its sidereal day. Venus rotates retrograde with a sidereal day lasting about 243.0 Earth days, or about 1.08 times its orbital period of 224.7 Earth days; hence by the ...

4. Observations and explorations of Venus - Wikipedia

   en.wikipedia.org/wiki/Observations_and...

   The planet's period of retrograde motion is 20 days on either side of the inferior conjunction. In fact, through a telescope Venus at greatest elongation appears less than half full due to Schröter's effect first noticed in 1793 and shown in 1996 as due to its thick atmosphere. Venus in daylight at 5 p.m. in the southern hemisphere ...

5. Planetary hours - Wikipedia

   en.wikipedia.org/wiki/Planetary_hours

   As each day is divided into 24 hours, the first hour of a day is ruled by the planet three places down in the Chaldean order from the planet ruling the first hour of the preceding day; [2] i.e. a day with its first hour ruled by the Sun ("Sunday") is followed by a day with its first hour ruled by the Moon ("Monday"), followed by Mars ("Tuesday ...

6. Rotation period (astronomy) - Wikipedia

   en.wikipedia.org/wiki/Rotation_period_(astronomy)

   The other type of commonly used "rotation period" is the object's synodic rotation period (or solar day), which may differ, by a fraction of a rotation or more than one rotation, to accommodate the portion of the object's orbital period around a star or another body during one day.

7. A New Study Says One Earth Day Is Going to Be 25 Hours Long - AOL

   www.aol.com/lifestyle/study-says-one-earth-day...

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8. Kepler's laws of planetary motion - Wikipedia

   en.wikipedia.org/wiki/Kepler's_laws_of_planetary...

   The function θ = f(M) is, however, not elementary. [33] Kepler's solution is to use E = ∠ z c x , {\displaystyle E=\angle zcx,} x as seen from the centre, the eccentric anomaly as an intermediate variable, and first compute E as a function of M by solving Kepler's equation below, and then compute the true anomaly θ from the eccentric ...

9. Length of a day on Mars is shrinking as planet is strangely ...

   www.aol.com/length-day-mars-shrinking-planet...

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