What is 18mo in Sidereal Hours?

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What is 18 Months (18mo) in Sidereal Hours (hr-sr)?

What is 18mo in hr-sr? Convert 18 Months (18mo) to Sidereal Hours (hr-sr) and show formula, brief history on the units and quick maths for the conversion.

Enter Months to convert to Sidereal Hours


Quick Reference for Converting Months to Sidereal Hours

Formula
hr-sr = mo x 732
Quick Rough Maths
To get the Sidereal Hours, multiply the number of Months by 732.0
Months (mo) in 1 Sidereal Hour
There are 0 Months in 1 Sidereal Hour
Sidereal Hours (hr-sr) in 1 Month
There are 732 Sidereal Hours in 1 Month

Unit Information

Month
/mʌnθ/
Symbol: mo
Unit System: SI

What is the Month?

The month is a unit of time and is a multiple of an SI base unit with the symbol mo.

There are 100s of definitions of a month that have been established, reviewed and adopted over the course of history but the most common around the world today are the months in the Julian and Gregorian calendars.

There are 12 months in the Julian and Gregorian year; averaging 30.4368 days in each. They are labelled January, February, March, April, May, June, July, August, September, October, November and December.

There is a famous rhyme to help remember how many days are in each month that goes “Thirty days has September, April, June and November – all the rest have thirty-one. Except February which has 28 or 29 in a leap year.”

Many cultures use the moon’s cycle (the lunar cycle) to define which month they are in.

Sidereal Hour
/sʌɪˈdɪərɪəlˈaʊə/
Symbol: hr-sr
Unit System: SI

What is the Sidereal Hour?

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

1 sidereal hour is made up of 60 sidereal minutes. This is derived ultimately from the sidereal day which is the time taken (in solar seconds) for the Earth to complete one rotation with respect to a distant star or constellation.

The sidereal hour angle is used when calculating sidereal time which is actually the angle along the celestial equator; from where one stands to the great circle that travels through the March equinox and both celestial poles.


Conversion Tables for Months (mo) to Sidereal Hours (hr-sr)