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Why is a year about 365 days long?

Updated: 8/10/2023
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12y ago

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It isn't. There are slightly more than 365 days in a year. A day it the time it takes for the earth to rotate about its axis. A year it the time it takes the earth to orbit the sun, being roughly how many 'spins' our planet makes on its axis during one full orbit of the sun.

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9y ago
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12y ago

That's the length of time it takes the earth to complete one orbital revolution

around the sun. That period of revolution is also connected ... for reasons perhaps

too complex to discuss just now ... to the period of a complete cycle of seasons.

It's actually closer to 365 and 1/4 days long (hence the leap year).

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13y ago

We seem to be "Children of the Sun" as it takes the Earth 365 days (actually a little less) to circle the Sun, our nearest star. It also happens to take the Earth about 24 hours (a little less, actually) to revolve or spin one complete turn.

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9y ago

That is a Julian year - a year in the Julian calendar, which has an extra leap day every 4 years. We use the Gregorian calendar with a year of 365.2425 days. That is the number of days it takes for the Sun to return to the same place in the sky each year. In our Gregorian calendar there are 97 leap years in every cycle of 400 years.

The number of days it takes to go round is determined by the average distance from the Sun. For every 1% increase in the average radius of an orbit, the 'year' increases by 1.5%, which is one of Kepler's laws.

We are at the distance we are purely by chance, and the conditions suited the development of life, which is why we are here. But at this distance the length of our year is fixed by Kepler's laws.

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7y ago

It is actually 365.25 days long because it takes that long to orbit the Sun once. To make up for the quarter day, we add an extra day every 4 years in a leap year. The 0.25 is actually slightly too big, so we forego the leap year every so often to adjust.

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12y ago

There are 365.25 days in a year. Not 365.

This is because: The amount of time it takes the Earth to complete a complete revolution around the Sun is 365.25 days.

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14y ago

A year is the time that it takes for Earth to go around the sun. The Earth always travels around the sun on the same path and at the same speed.

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14y ago

It's Not. It's about 365.24 days.

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