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Why is Mean Solar Day 24h and 361 degrees but Sidereal Day is 23hr 56 m and 360 degrees?

Updated: 4/28/2022

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12y ago

it takes earth slightly longer to rotate one full rotation on its axis because it orbits the sun

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12y ago

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Q: Why is Mean Solar Day 24h and 361 degrees but Sidereal Day is 23hr 56 m and 360 degrees?
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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 the length of a day for all of the planet to planet?

There are two main definitions of "day" for a planet:1) Sidereal day. That's the time taken to rotate once.2) Solar day. That's the time taken for the Sun to complete one apparent journeyaround the sky. Usually it's given as the "mean solar day", which is the average value.The solar day depends on the planet's orbital motion, as well as its rotation.Here are the details, with slight approximations:Mercury : sidereal day, 58.65 Earth dayssolar day, 175.94 Earth daysVenus: sidereal day, 243.02 Earth dayssolar day, 116.75 Earth daysEarth: sidereal day, 23.934 hourssolar day, 24.000 hoursMars: sidereal day, 24.623 hourssolar day, 24.660 hoursFor these planets both days are nearly the same length:Jupiter: 9.92 hoursSaturn: 10.66 hoursUranus: 17.24 hoursNeptune: 16.11 hours

Are there 23hr and 56min in a day?

Most certainly, yes. There are 23 hours 56 minutes and 4.1 seconds (very nearly) in a SIDEREAL day. The sidereal day is a very important concept, although it is not an easy one to understand initially. The earth rotates exactly 360 degrees, a full rotation, in 23 hours 56 minutes and 4.1 seconds. One day of Universal time (UTC) is exactly 24 hours in length, during which the earth rotates a little more than 360 degrees. It should be obvious that the beginning of the sidereal day will wander around the standard clock-- all the way round, in fact, during the course of a year. For example, there is a day when "sidereal midnight" will coincide with noontime at Greenwich.

How long are days on earth?

There are different frames of reference: 1 True solar day 2 Mean solar day 3 Stellar (sidereal) day If you calculate 60 seconds times 60 minutes times 24 hours you get 86 400 seconds.

What is the difference between earth days and days?

A "sidereal day" on any planet is the time it takes the planet to rotate exactly once on its axis. On Earth that takes about 23 hours and 56 minutes. There's also the "mean solar day". That depends on the position of the Sun in the sky, and on Earth it's 24 hours long. The "mean solar day" is what's normally meant by an "Earth day". The word "day " is also used for the equivalent things on other planets. For example, Mars has a sidereal day of about 24 hours and 37 minutes, and Mars has a solar day that's about 2 minutes longer.

Which planets day is more than half as long as its year?

It's Mercury or Venus depending on whichthe definition of "day "you mean.

What is the difference in mean solar time between 30 degrees N 75 degrees W and 30 degrees N 90 degrees W?

the difference is 1 hour because every 15 degrees is 1 hour

What does sidereal mean?

Sidereal refers to the measurement of time based on the position of the stars, specifically the time it takes for a specific star to return to the same position in the sky. It is often used in astrology and astronomy to determine celestial events and positions.

What is the time gap between mean solar day and sidereal day?

Here's the answer, for planet Earth. A "solar day" is the time between the Sun's successive highest points in the sky. Astronomers refer to these peaks as "culminations". There is some natural variation in the length of this "day". However, clocks use the "mean solar day". This is an average of the solar day lengths during a year and is indeed exactly 24 hours. A "sidereal day" is the period from when a particular star reaches its peak until the next night when the same star reaches its peak again. This is 23 hours 56 minutes (and a few seconds). So, the gap is just less than 4 minutes. The difference is caused by the fact that the Earth is continuing along in its orbit while it is spinning. After precisely one rotation, or one sidereal day, we find that the Sun is still a few minutes away from reaching its peak, and it takes the Earth another 4 minutes or so to turn enough so that the Sun is once again at its highest point in the sky.

Is an earth day a solar or sidereal day?

It depends. Earth has both sidereal and solar days. Earth's sidereal day is about 23 hours and 56 minutes. This is the time it takes Earth to spin on its axis. For the Sun to appear at the same place in the sky (solar day) it takes about four more minutes. So it all depends on what you are asking: the time it takes Earth to spin on its axis or the time it takes the Sun to appear at the same place in the sky (noon to noon). The reason there is a difference is because the Earth is rotating about its axis at the same time it is orbiting the Sun. When it has made a full rotation, it still has to turn further to line up with the Sun which is now slightly east of where it was the day before, as the Earth moves around its orbit, about a degree per day. Actually, there's some natural variation in the length of the solar day. So, for our clocks, we use "mean solar time" which averages out the differences, giving us the solar day of exactly 24 hours. Incidentally, you often see the rotation times and orbit times of other planets given in "Earth days". In this case it's usually the Earth's solar day that's meant, but not always.

What planet in your solar system has the longest day?

Venus, its day is equivalent to 243 Earth Days. That's the rotation period, or "sidereal day". However the "solar day" on Venus is only about 117 Earth days. If you mean the "solar day" then Mercury has the longest day because Mercury has a solar day of about 176 Earth days.

In earth hours how long does it take for earth to rotate once?

24 hours for the civil day, the time period that was originally based on the mean solar day. But an absolute rotation (sidereal rotation period) takes 23 hours, 56 minutes and 4.1 seconds roughly.