What is 5500hr in Sidereal Days?

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What is 5500 Hours (5500hr) in Sidereal Days (d-sr)?

What is 5500hr in d-sr? Convert 5500 Hours (5500hr) to Sidereal Days (d-sr) and show formula, brief history on the units and quick maths for the conversion.

Enter Hours to convert to Sidereal Days


Quick Reference for Converting Hours to Sidereal Days

Formula
d-sr = hr / 23.93
Quick Rough Maths
To get the Sidereal Days, divide the number of Hours by 23.9
Hours (hr) in 1 Sidereal Day
There are 23.93 Hours in 1 Sidereal Day
Sidereal Days (d-sr) in 1 Hour
There are 0.04 Sidereal Days 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 Day
/sʌɪˈdɪərɪəl deɪ/
Symbol: d-sr
Unit System: SI

What is the Sidereal Day?

The sidereal day is a unit of time used by astronomers and is derived from the SI unit system. We have used the symbol d-sr.

Sidereal literally means "of the stars". Otherwise known as the "orbital period", it defines the time period taken for two point masses to orbit each other.

On Earth, we used the solar day to regularise time and this represents the period taken to orbit the sun. The sidereal day (or stellar day) is the time taken for the earth to rotate with respect to a distant star and equals 23 hours, 56 minutes and 4.0905 seconds (or 86164.1 s, 23.934 h).


Conversion Tables for Hours (hr) to Sidereal Days (d-sr)