What is 420d-sr in Sidereal Years?

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What is 420 Sidereal Days (420d-sr) in Sidereal Years (a-sr)?

What is 420d-sr in a-sr? Convert 420 Sidereal Days (420d-sr) to Sidereal Years (a-sr) and show formula, brief history on the units and quick maths for the conversion.

Enter Sidereal Days to convert to Sidereal Years


Quick Reference for Converting Sidereal Days to Sidereal Years

Formula
a-sr = d-sr / 366.26
Quick Rough Maths
To get the Sidereal Years, divide the number of Sidereal Days by 366.3
Sidereal Days (d-sr) in 1 Sidereal Year
There are 366.26 Sidereal Days in 1 Sidereal Year
Sidereal Years (a-sr) in 1 Sidereal Day
There are 0 Sidereal Years in 1 Sidereal Day

Unit Information

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).

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 Sidereal Days (d-sr) to Sidereal Years (a-sr)