Sidereal day
Jour sidéral | 恒星日／コウセイビ | 恒星日
A unit of time used by astronomers defined as the interval of time taken by a star to make two successive upper meridian transits.
A unit of time used by astronomers defined as the interval of time taken by a star to make two successive upper meridian transits.
Terms with the same letter
Safety roller Sapphire Scale Scratchproof Screw Second Secret spring Secular Perpetual calendar Self-winding (Automatic) Set (to) Setting Ship's chronometer Shock absorber Shockproof Sidereal day Silent Simple calendar (watch) Skeleton Skeleton movement Slide Smoky quartz Snailing Snap Snow setting Sodalite Solstice Souscription (watch) Specific gravity Spectroscope Spinel Split-seconds (chronograph) Split-seconds chronograph Spring Stamping Stamping press Steel Step motor Stippling (Spotting) Stone Stopwork Strap Striking mechanism Stud Subsidiary seconds Sunray brushing Sunrise and sunset Sweep seconds Swiss T 25 (T Swiss made) Sympathique Synthetic ruby (Scientific ruby) Synthetic stone