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the amount of time the sun takes to cross the meridian twice
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∙ 15y ago
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What is apparent solar time determined by?
Its position and apparent movement around the sky. "Apparent solar time" is based on the "apparent solar day", reckoned by defining as 'solar noon' the moment of the Sun's highest altitude above the horizon on any given day. (That's when the Sun crosses the observer's meridian.) Apparent solar days do not have the exact same length (from one solar noon to the next) throughout the year, which is surprising to some at first. This is why the first approaches to creating a solid "standard time" involved determining the length of the 'mean solar day' (average solar day).
What is time based on the average year round length of the apparent solar day?
Standard solar time
What is a mean solar day?
It's the average length of the "apparent solar day" throughout the year, 24 hours exactly for planet Earth.
During which two seasons is apparent solar time ahead of clock time?
Apparent solar time is ahead of the clock in Spring and Fall. Apparent solar time is seen while using a sundial.
Why do we use the mean solar day rather then the sidereal day to measure the time for one earth rotation?
We don't. The sidereal day IS used as the measure of the Earth's rotation. The mean solar day is used to regulate our daily lives because that's the average time for the Sun to complete its apparent daily journey round the sky. The difference is because the solar day takes into account the effect of the Earth's orbital motion which slightly alters the position of the Sun in the sky.
What is apparent solar time determined by?
Its position and apparent movement around the sky. "Apparent solar time" is based on the "apparent solar day", reckoned by defining as 'solar noon' the moment of the Sun's highest altitude above the horizon on any given day. (That's when the Sun crosses the observer's meridian.) Apparent solar days do not have the exact same length (from one solar noon to the next) throughout the year, which is surprising to some at first. This is why the first approaches to creating a solid "standard time" involved determining the length of the 'mean solar day' (average solar day).
What is time based on the average year round length of the apparent solar day?
Standard solar time
What is a mean solar day?
It's the average length of the "apparent solar day" throughout the year, 24 hours exactly for planet Earth.
Why is apparent solar time not used to measure on a clock?
Because, when using "apparent solar time", the length of a "solar day" varies slightly during the year. (This is because the Earth's orbit isn't exactly circular and the Earth's axis is tilted.) "Clock time" is based on an average (or "mean") of these day lengths, called the "mean solar day". So clocks use "mean solar time". (By coincidence, on the date the question was answered (14th April) "apparent solar time" and 'clock' time are synchronised.) There's another reason for apparent solar time being different from clock time. "Clock time" uses time zones. So, over a wide area, the time on a clock equals the "mean solar time" at a particular, defining, longitude.
The sun casts the shortest shadow of the day at noon acorrding to what?
Apparent solar time
What is mercury's solar day about?
Mercury's solar day is about 176 Earth days. That's the time taken by the Sun to complete one apparent trip round the sky.
What a day about as long as a day on earth?
Mars has a similar day length to Earth, a little longer at 24h 39m 35s (apparent solar day)
What is the relationship between apparent solar time and mean solar time?
The Earth "day" of exactly 24 hours is the "mean solar day""Mean" is basically a scientific way of saying "average". It's called a "solar day " because it's based on the position of the Sun in the sky.There are natural variations in the length of the solar day because of the Earth's elliptical orbit and axial tilt.The "mean solar day" averages out the variations that happen during the year.This makes things much more convenient for everyday life."Mean solar time" is based on the "mean solar day".The "apparent solar day" is the what we actually observe, and its length varies from day to day.A sundial measures "apparent solar time". We can convert this time to mean solar time by using something called "the equation of time".Actually, the sundial shows "local apparent solar time".That's because the time shown by a sundial depends on its exact longitude.For convenience, mean solar time has time zones (based on longitude).So, longitude also affects the relationship between these twomeasures of time.
Mars length of one day?
Mars has a similar day length to Earth, a little longer at 24h 39m 35s (apparent solar day).
Why is apparent solar time used to measure time on a clock?
Because, when using "apparent solar time", the length of a "solar day" varies slightly during the year. (This is because the Earth's orbit isn't exactly circular and the Earth's axis is tilted.) "Clock time" is based on an average (or "mean") of these day lengths, called the "mean solar day". So clocks use "mean solar time". (By coincidence, on the date the question was answered (14th April) "apparent solar time" and 'clock' time are synchronised.) There's another reason for apparent solar time being different from clock time. "Clock time" uses time zones. So, over a wide area, the time on a clock equals the "mean solar time" at a particular, defining, longitude.
During which two seasons is apparent solar time ahead of clock time?
Apparent solar time is ahead of the clock in Spring and Fall. Apparent solar time is seen while using a sundial.
Planet with the period of revolution closest to Earth's?
Mars has a similar day length to Earth, a little longer at 24h 39m 35s (apparent solar day).
