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TSL, ou temps sidéral local, est l'ascension droite au méridien, c'est-à-dire, l'angle entre le méridien et le point vernal (position du Soleil au début du printemps de l'hémisphère nord), mesuré vers l'ouest, le long de l'équateur céleste.
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LST or Local Sidereal Time, is the right ascension on the meridian, i.e., the angle from the meridian, measured westward along the celestial equator, to the vernal equinox (the sun's position at the start of northern hemisphere spring). It is given for 00:00 standard time each day, and increases by 24 hours 03 minutes and 56 seconds for each 24 hours of solar (standard) time. Local Sidereal Time is used by observers of the night sky, as it measures the rotation of the earth relative to the fixed stars.
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