Back Sinodiese dag Afrikaans يوم اقتراني Arabic Dia sinòdic Catalan روز هلالی Persian संयुति दिवस Hindi Synodische dag Dutch Солнечные сутки Russian Synodic day SIMPLE Synodický deň Slovak Synodisk rotationsperiod Swedish
A synodic day (or synodic rotation period or solar day) is the period for a celestial object to rotate once in relation to the star it is orbiting, and is the basis of solar time.
The synodic day is distinguished from the sidereal day, which is one complete rotation in relation to distant stars[1] and is the basis of sidereal time.
In the case of a tidally locked planet, the same side always faces its parent star, and its synodic day is infinite. Its sidereal day, however, is equal to its orbital period.
- ^ Gerard, T. Hooft; Stefan, Vandoren (12 May 2014). Time in Powers of Ten: Natural Phenomena and Their Timescales. World Scientific. ISBN 9789814494939.