How many microsecond in 1 tropical year?
The answer is 31556925445000.

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

You can view more details on each measurement unit:

microsecond or
tropical year

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

1 second is equal to 1000000 microsecond, 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 microseconds 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.

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

microsecond to month

microsecond to millennium

microsecond to millisecond

microsecond to minute

microsecond to quarter

microsecond to century

microsecond to decade

microsecond to day

microsecond to second

microsecond to nanosecond

The SI prefix "micro" represents a factor of
10^{-6}, or in exponential notation, 1E-6.

So 1 microsecond = 10^{-6} arcseconds.

The definition of a second is as follows:

A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 (approximately 7.7×10-7) of a circle. It is the angular diameter of an object of 1 unit diameter at a distance of 360×60×60/(2pi) (approximately 206,265 units), such as (approximately) 1 cm at 2.1 km, or, directly from the definition, 1 astronomical unit at 1 parsec.

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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