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5 lis 2019 · A Mean Solar Day is 24 hours. An apparent day may be between 20 to 30 seconds shorter or longer than this due to the effects above but obviously, for the sake of timekeeping, it is sensible to use an average. The mean sun is an imaginary sun which matches a mean solar day exactly.
18 paź 2024 · Earth's rotation period relative to the Sun (solar noon to solar noon) is its true solar day or apparent solar day. It depends on Earth's orbital motion and is thus affected by changes in the eccentricity and inclination of Earth's orbit.
The Earth rotates on its axis relative to the Sun every 24.0 hours mean solar time, with an inclination of 23.45 degrees from the plane of its orbit around the Sun. Mean solar time represents an average of the variations caused by Earth's non-circular orbit.
Apparent Solar Time (AST), is the time the Sun shows in the day. We can make a sundial to tell this. Mean Solar Time (MST) is the time on our watches that humans have invented as Sun time is an unreliable way to tell the time for society.
Day, night, and the seasons. The Earth takes 365 days, 1 whole year, to complete one orbit around the Sun! Over this period of time, changes are seen and felt, for example, days are shorter or longer and temperatures are higher or lower.
24 hours on Earth is, roughly, one solar day. That’s because Earth’s orbit is elliptical - it’s not a perfect circle around the sun. This means that some solar days are a few minutes longer than 24 hours, and some are a few minutes shorter.
Mean solar time is the basis for the 24-hour clock used in daily life, with each hour representing 1/24th of the average solar day. The Equation of Time is used to convert between apparent solar time and mean solar time, accounting for the irregularities in the Sun's motion.
