Years {anomalistic year} can be time from Earth perihelion to next perihelion, which is five minutes longer than sidereal years, because major axis of Earth elliptical orbit moves around Sun in same direction as Earth moves.
Years {sidereal year} can be time between same positions with respect to fixed stars. Time {sidereal time} can be relative to fixed stars.
Years {tropical year} can be time from first point of Aries to next first point of Aries, which is 20 minutes shorter than sidereal year, because first point moves around Sun in opposite direction to Earth motion.
5-Physics-Measurement-Kinds-Time
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Date Modified: 2022.0225