Geog
2007-01-26 09:24:02 · 5 answers · asked by bmw z 1 in Science & Mathematics ➔ Geography
360 degrees in 24 hours.
1 degree in 24 / 360 hours = 60 x 24 / 360 miutes = 4 minutes
Th
2007-01-26 09:30:17 · answer #1 · answered by Thermo 6 · 2⤊ 0⤋
The solution of 60*24/360 is incorrect. The Earth has to accumulate a whole one turn througout the year in order for the solar day to start, well, in the morning. To illustrate this point, consider that you are standing at the equator at 12pm and the sun is directly above you. Once the planet makes about 90 full turns (takes roughly 90 days) the sun would then be located at a 90 degree angle to the vertical, i.e. not over your head but at the horizon.
So, we have to subtract a value of (360/365) from 360 in the above formula to compensate for that.
(60*24)/(360-360/365) is the answer.
2007-01-26 17:41:20 · answer #2 · answered by stopwar11112 3 · 0⤊ 1⤋
four minutes per degree is just about right
The period of rotation for the Earth is just about 23 hours and 56 minutes. This is to make up for the rotation lost during one full solar orbit. The extra degree added to get back to 'noon' from the previous 'noon' eats up the other four minutes. As a result the earth actually makes 366.25+ rotations per revolution (year). These are average values and vary somewhat during the year. We have just past perihelion, (closest to the sun, yes closest) and are moving about the fastest for the year in our orbit. As a result the Earth moves a bit further in its 'day'. This makes the "solar day" is a bit longer than the "civil day" at this time of year.
We are at aphelion around July 4 so the opposite is true then.
This is why they have the 'sun fast' and 'sun slow' corrections in almanacs. (So you can correct your sundial readings)
Since the sun and moon are just about 1/2 degree wide as seen from the Earths surface, it takes about 2 minutes for either of them to seem to move one diameter across the sky. Don't try to time this when they are near the horizon as the refraction of the air will throw this off.
2007-01-26 18:37:14 · answer #3 · answered by sternsheets 2 · 3⤊ 0⤋
it takes forty minutes for the earth to rotate through one degree of longitude.
2007-01-27 02:31:49 · answer #4 · answered by Anonymous · 0⤊ 0⤋
1 Hour = 15 deg.
2007-01-26 17:53:17 · answer #5 · answered by JOHNNIE B 7 · 0⤊ 0⤋