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Convert Hour (h) to Second (Sidereal) (s (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.

Second (Sidereal) (s (sidereal))

A sidereal second is 1/60 of a sidereal minute, equal to about 0.99727 solar seconds. While the difference seems small, it accumulates noticeably over long observing sessions. Sidereal seconds ensure that telescope mounts and tracking systems remain synchronized with the rotation of the celestial sphere. The distinction between solar and sidereal seconds underscores the complexity of Earth's rotational dynamics—reminding us that even "one second" depends on which cosmic frame of reference we choose.

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 Second (Sidereal)