answersLogoWhite

0

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.

User Avatar

Wiki User

7y ago

Still curious? Ask our experts.

Chat with our AI personalities

LaoLao
The path is yours to walk; I am only here to hold up a mirror.
Chat with Lao
SteveSteve
Knowledge is a journey, you know? We'll get there.
Chat with Steve
ReneRene
Change my mind. I dare you.
Chat with Rene
More answers

The 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.


User Avatar

Wiki User

7y ago
User Avatar

defined as 365.25 days

User Avatar

Wiki User

13y ago
User Avatar

There are 365 days in our Gregorian calendar (1st January to 31st December). There are 366 days in a Leap Year.

User Avatar

Wiki User

7y ago
User Avatar

Add your answer:

Earn +20 pts
Q: How many days are exactly in a year?
Write your answer...
Submit
Still have questions?
magnify glass
imp