What is another word for sidereal year?
Pronunciation: [sa͡ɪdˈi͡əɹɪə͡l jˈi͡ə] (IPA) 
A sidereal year is the time it takes for the Earth to make one orbit around the sun with respect to the fixed stars. This period of time is often referred to as the tropical year, which is the time it takes for the Earth to complete one full orbit of the sun with respect to the vernal equinox. Another synonym for sidereal year is the astronomical year, as it is the period of time used by astronomers to measure the motion of the Earth. Geophysicists and astronomers also use the term orbital period when referring to the sidereal year. Regardless of the terminology used, understanding the sidereal year is essential to understanding Earth's orbit and its place in our solar system.
