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Convert Hour (h) to Year (Sidereal) (y (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.

Year (Sidereal) (y (sidereal))

A sidereal year is the time it takes Earth to complete one full orbit relative to distant fixed stars, lasting approximately 365.25636 days. This is the "true" orbital period of Earth in space, unaffected by precession-related shifts of the equinoxes. Sidereal years are used in celestial mechanics, spacecraft navigation, and modeling solar system dynamics. The slight difference between the tropical and sidereal year (about 20 minutes) reveals how Earth's wobbling axis alters how we perceive time, creating two distinct astronomical year definitions.

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 Year (Sidereal)