The Mechanics of Earth's Spin Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 ...

Uranus just got a little more time on its hands. A fresh analysis of a decade's worth of Hubble Space Telescope observations shows Uranus takes 17 hours, 14 minutes and 52 seconds to complete a full ...

A day on Uranus is about half a minute longer than previously thought, according to new research. An analysis of 11 years of Hubble Space Telescope observations shows that Uranus' day lasts 17 hours, ...

rotation. Here’s the puzzle: That is about 6 minutes, or one percent, longer than the radio rotational period measured by the Voyager 1 and Voyager 2 spacecraft, which flew by Saturn in 1980 and 1981.

Tracking the rotation speed of solid planets, like the Earth and Mars, is a relatively simple task: Just measure the time it takes for a surface feature to roll into view again. But giant gas planets ...

Hi’iaka is the larger outer satellite of the dwarf planet Haumea. Using relative photometry from the Hubble Space Telescope and Magellan and a phase dispersion minimization analysis, we have ...

Data from the European Space Agency's Gaia mission has enabled the creation of a detailed catalog of asteroid rotations through the analysis of their light curves. These curves measure the variations ...