How many days in 1 tropical year?
The answer is 365.24219265046.

We assume you are converting between **day** and **tropical year**.

You can view more details on each measurement unit:

days or
tropical year

The SI base unit for **time** is the second.

1 second is equal to 1.1574074074074E-5 days, or 3.1688765172731E-8 tropical year.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between days and years.

Type in your own numbers in the form to convert the units!

You may also want to find out how many days
are between two dates on the calendar. Use the
**date calculator**
to get your age in days or measure the duration of an event.

1 days to tropical year = 0.00274 tropical year

10 days to tropical year = 0.02738 tropical year

50 days to tropical year = 0.1369 tropical year

100 days to tropical year = 0.27379 tropical year

200 days to tropical year = 0.54758 tropical year

500 days to tropical year = 1.36895 tropical year

1000 days to tropical year = 2.73791 tropical year

You can do the reverse unit conversion from tropical year to days, or enter any two units below:

days to hour

days to microsecond

days to nanosecond

days to quarter

days to month

days to decade

days to fortnight

days to week

days to millisecond

days to second

A continuous period of 24 hours which, unless the context otherwise requires, runs from midnight to midnight.

The mean tropical year is defined as the period of time for the mean ecliptic longitude of the Sun to increase by 360 degrees. Since the Sun's ecliptic longitude is measured with respect to the equinox, the tropical year comprises a complete cycle of the seasons; because of the biological and socio-economic importance of the seasons, the tropical year is the basis of most calendars.

The International Union of Pure and Applied Chemistry and the International Union of Geological Sciences have jointly recommended using defining the annus, with symbol a, as the length of the tropical year in the year 2000:

a = 31556925.445 seconds (approximately 365.24219265 ephemeris days)

We default to using the Gregorian year on this site, but you can select a specific type of year by entering the full name like "tropical year".

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