Convert Milliarcsecond to Arcsecond
Input the number of milliarcseconds you want to convert to arcseconds.
How to Convert Milliarcseconds to Arcseconds
The milliarcsecond and arcsecond are both units of angle. 1 arcsecond equals 999.9992008 milliarcseconds. This means to convert milliarcseconds to arcseconds, you divide by 999.9992008.
Formula
Step-by-Step Example
Convert 5 mas to arcseconds:
We need to convert milliarcseconds to arcseconds
Since 1 ″ = 999.9992008 mas, divide by 999.9992008
5 ÷ 999.9992008 = 0.005000004
5 mas = 0.005000004 ″
Milliarcsecond to Arcsecond Conversion Table
Quick reference table for common milliarcsecond to arcsecond conversions. Click any value for detailed calculation.
| Milliarcseconds (mas) | Arcseconds (″) |
|---|---|
| 0.1 mas | 0.0001000001 ″ |
| 0.5 mas | 0.0005000004 ″ |
| 1 mas | 0.0010000008 ″ |
| 2 mas | 0.0020000016 ″ |
| 5 mas | 0.005000004 ″ |
| 10 mas | 0.010000008 ″ |
| 25 mas | 0.02500002 ″ |
| 50 mas | 0.05000004 ″ |
| 100 mas | 0.1000000799 ″ |
About These Units
Milliarcsecond (mas)
A milliarcsecond (mas) is 1/1000 of an arcsecond. Milliarcseconds measure stellar parallax (nearest star: 768 mas), proper motion, and high-precision astrometry. The Gaia satellite measures positions to ~0.02 mas accuracy.
Arcsecond (″)
An arcsecond (″) is 1/60 of an arcminute or 1/3600 of a degree. Arcseconds measure stellar positions, telescope resolution, and atmospheric seeing. The Hubble Space Telescope resolves about 0.05 arcseconds. GPS accuracy is measured in arcseconds.
Frequently Asked Questions
How do I convert milliarcseconds to arcseconds?
To convert milliarcseconds to arcseconds, divide the value by 999.9992008. For example, 10 mas = 0.010000008 ″.
How many arcseconds are in 1 milliarcsecond?
1 milliarcsecond equals 0.0010000008 arcseconds.
What is the formula for milliarcseconds to arcseconds?
The formula is: ″ = mas ÷ 999.9992008.