Convertir hour (sidereal) en secondes

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Hour (Sidereal)

La sidereal hour is one twenty-fourth of a sidereal day, the period of Earth's rotation relatif à the fixed stars. Il est utilisé en astronomy for expressing right ascension coordinates and scheduling telescope observations. One sidereal hour est égal à approximativement 3,590.17 seconds (≈59 minutes 50 seconds). 


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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