Group dynamics - A term that implies that our thoughts and behavior are influenced by the groups of which we are members and, in turn, we influence the thought process and behavior of the group as a whole.
One sidereal day is the time it takes for a star in the sky to come back to the same place in the sky. Because, for all intents and purposes, the sky is âfixedâ, a sidereal day is when the earth rotates 360Â°. A sidereal day is 23 hours 56 minutes and 4.09 seconds long. A sidereal year is the time it takes for the sun to return to the same position with respect to the stars. Due to the precession of the equinoxes the sidereal year is about 20 minutes longer than the tropical year.
So, the sidereal rotation period is the TRUE ROTATION PERIOD of a celestial body. As in how much time elapses from when any distant star of interest rises to when same distant star rises again. It was later confirmed by inertial measurements, that without even looking outside Earth's atmosphere, we could measure its true rotation period.