Convertir day (sidereal) en secondes

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Vice versa: secondes en day (sidereal)

Day (Sidereal)

La sidereal day is the period of Earth's rotation measured relatif à the distant stars rather than the Sun, making it slightly shorter than the solar day. Il est the true rotational period of the Earth and is fundamental to astronomical coordinate systems and telescope tracking. One sidereal day est égal à approximativement 23 hours, 56 minutes, and 4.091 seconds (86,164.091 s). 


seconde

La second (symbol: s , abréviation: sec ) is the unité de base de temps dans le Système international d'unités (SI) (SI) (French: Système International d’unités), couramment understood and historiquement défini comme 1/86400 of a day – ce factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each. Analog clocks and watches souvent have sixty tick marks on their faces, representing seconds (and minutes), and a "second hand" to mark the passage de temps in seconds. Digital clocks and watches souvent have a two-digit seconds counter. La seconde is aussi part of several other units of measurement like meters par seconde for velocity, meters par seconde par seconde for acceleration, and cycles par seconde for frequency. 


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