Convert Hours (hr) to Sidereal Years (a-sr) | hr in a-sr

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Let's convert Hours (hr) to Sidereal Years (a-sr)

This quick and easy calculator will convert Hours (hr) to Sidereal Years (a-sr) and show formula, brief history on the units and quick maths for the conversion.

Enter Hours to convert to Sidereal Years


Quick Reference for Converting Hours to Sidereal Years

Formula
a-sr = hr / 8766.15
Quick Rough Maths
To get the Sidereal Years, divide the number of Hours by 8.8 thousand
Hours (hr) in 1 Sidereal Year
There are 8766.15 Hours in 1 Sidereal Year
Sidereal Years (a-sr) in 1 Hour
There are 0 Sidereal Years in 1 Hour

Unit Information

Hour
/ˈaʊə/
Symbol: hr
Unit System: SI

What is the Hour?

The hour is a unit of time and is a multiple of an SI base unit with the symbol hr.

There are 60 seconds in a minute and 60 minutes in an hour. Consequently, there are 3600 seconds in an hour.

In a mean solar day, there are 24 hours.

Originally in the Middle East, the hour was defined as 1/12 of the day or night time. However, seasonal factors clearly affected all of these definitions and an average is used today to normalise and allow calculations.

Sidereal Year
/sʌɪˈdɪərɪəl jɪə,jəː/
Symbol: a-sr
Unit System: SI

What is the Sidereal Year?

The sidereal year is a unit of time that is a multiple of an SI unit. We have used the symbol a-sr.

From the Latin ‘sidus’ for ‘star’, sidereal is a term used to describe the orbital time of the earth or an object to complete one full cycle with respect to a fixed, distant star or constellation pattern.

The sidereal year is defined as 365.242 190 402 days of 86,400 SI seconds. This is 20 minutes and 24.5 seconds longer than a tropical year.


Conversion Tables for Hours (hr) to Sidereal Years (a-sr)