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.

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 ...

Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes and 4 seconds with respect to other distant stars. Scientists call this difference crucial to ...

MY estimate of a decrease of 0.3 sec. in the rotation period (strictly the ‘tumbling’ period) is the residual effect, after making allowance for the difference between the flash period and the true ...

Laboratory rotations (research rotations) are to be conducted in a minimum of three different laboratories. Incoming students who worked full-time for a minimum of four weeks in the lab of a faculty ...

At the International Earth Rotation and Reference Systems Service in Paris, a quiet calculation takes place several times a ...