lunar time period
Noun: A natural unit of time based on the Moon's cycle, specifically the approximately 12-hour and 25-minute interval between successive lunar tides. This period is half of a lunar day, which is the time it takes for the Moon to return to the same meridian in the sky.
This term is a technical and scientific compound noun used primarily in astronomy, oceanography, and related fields to describe a specific temporal measurement linked to lunar motion.
- The lunar time period between high tides is roughly 12 hours and 25 minutes.
- Sailors in ancient times had to understand the lunar time period to navigate coastal waters safely.
- The study of tidal patterns requires precise calculation of the lunar time period.
- The term is often used in contrast to solar time periods (based on the Sun). For example, the mismatch between the lunar time period and the 24-hour solar day is why high tides occur about 50 minutes later each day.
- Lunar Day: The full period of about 24 hours and 50 minutes for the Moon to complete one cycle relative to an observer on Earth. A lunar time period is half of a lunar day.
- Tidal Period: A more general term for the interval between successive high (or low) tides, which is governed by the lunar time period but can be modified by local geography.
- Tidal interval (specifically the lunar component)
- Lunar interval
This term refers specifically to the temporal component of the lunar influence. While it explains the fundamental timing of tides ("there are usually two high and two low tides each day"), the actual height and pattern of those tides are affected by other factors like the Sun's gravity and coastal shape. The definition provided in the context describes the observable effect (two tides per day) of this underlying lunar time period.
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there are usually two high and two low tides each day
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