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Convert Hour (h) to Hour (Sidereal) (h (sidereal)) instantly.

About these units

Hour (h)

An hour, defined as 60 minutes or 3,600 seconds, is one of the most universally recognized time units. It emerged from ancient Egyptian timekeeping, where daylight was divided into 12 equal segments, a tradition that eventually influenced Greek and Roman clocks. The hour structures human activities: work schedules, travel planning, academic periods, medical dosing intervals, and astronomical observations. Its widespread adoption across cultures demonstrates the human tendency to organize life into consistent, predictable cycles. Even in scientific contexts where seconds dominate, the hour persists in fields like meteorology, orbital mechanics (e.g., solar time), and industrial processes. It bridges the gap between precise atomic time and everyday human experience.

Hour (Sidereal) (h (sidereal))

A sidereal hour is 1/24 of a sidereal day, approximately 59 minutes and 50.17 seconds of solar time. Astronomers use sidereal hours to measure right ascension and to coordinate telescope pointing systems. Because stars return to the same apparent position after exactly one sidereal day, sidereal hours offer a stable celestial reference frame. While not used in daily life, sidereal hours are indispensable for precision observation of the universe.

More Hour converters

Hour [h] ↔ Second [s]
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Hour [h] ↔ Minute [min]
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Hour [h] ↔ Day [d]
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Hour [h] ↔ Week [week]
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Hour [h] ↔ Month [month]
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Hour [h] ↔ Year [y]
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Hour [h] ↔ Millisecond [ms]
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Hour [h] ↔ Microsecond [µs]
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Hour [h] ↔ Nanosecond [ns]
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Hour [h] ↔ Picosecond [ps]
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Hour [h] ↔ Femtosecond [fs]
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Hour [h] ↔ Attosecond [as]
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Hour [h] ↔ Decade [decade]
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Hour [h] ↔ Century [century]
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Hour [h] ↔ Millennium [millennium]
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Hour [h] ↔ Shake [shake]
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Hour [h] ↔ Planck Time [tₚ]
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Hour [h] ↔ Month (Synodic) [month (synodic)]
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Hour [h] ↔ Year (Julian) [y (Julian)]
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Hour [h] ↔ Year (Leap) [y (leap)]
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Hour [h] ↔ Year (Tropical) [y (tropical)]
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Hour [h] ↔ Year (Sidereal) [y (sidereal)]
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Hour [h] ↔ Day (Sidereal) [d (sidereal)]
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Hour [h] ↔ Hour (Sidereal) [h (sidereal)]
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Hour [h] ↔ Minute (Sidereal) [min (sidereal)]
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Hour [h] ↔ Second (Sidereal) [s (sidereal)]
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Hour [h] ↔ Fortnight [fortnight]
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Hour [h] ↔ Septennial [7 years]
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Hour [h] ↔ Octennial [8 years]
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Hour [h] ↔ Novennial [9 years]
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Hour [h] ↔ Quinquennial [5 years]
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Hour [h] ↔ Quindecennial [15 years]
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Convert Hour to Hour (Sidereal)