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The earth year changes every year so only a mean value can be given.
It also depends upon which year you mean.
In 2000 AD the mean time interval of a year was:
Sidereal (orbit to same place in space): 365.2564 days
Tropical (orbit to same time in space): 365.24219 days
Between two March equinoxes: 365.24237 days
Between two June solstices: 365.24162 days
Between two September equinoxes: 365.24201 days
Between two December solstices: 365.24274 days
Atomic clock year: approx 290,091,200,500,000,000 oscillations of cesium (or 365.2422 days).
It is because it is slightly short of 365.25 days, that the Gregorian calendar only makes centuries leap years if the year is divisible by 400 to correct for this.
As the atomic clock is more accurate than the earth rotation, leap seconds are added every so often to allow for the earth's rotation which is gradually slowing down.
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SteveThe period of time that the earth takes so that the Sun appears to go from equinox to equinox is the Tropical Year which is 365.242 days. However, the equinoxes, themselves, undergo precession and this means that Sidereal Year, the time taken for the Sun to appear to be aligned with the same background stars is 365.242189 days.
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How many months have exactly 28 days?
Only February has exactly 28 days in a non leap year.
How many days exactly in a year?
365.25 days. If you want a more exact answer you have to specify whether you mean the vernal equinox year, the sidereal year or the tropical year.
How many years are there in 1460 days?
Exactly 4 years (excluding a leap year !)
How many days exactly did Andrew Jackson serve for?
He served 2922 solar days. (This does not account for which years leap year was on, but accounts for the actual amount of days in a year 365.25.)
72 hours is exactly how many days?
3 days, exactly.
