milliarcsecond
Angleexact by definition
The milliarcsecond is a thousandth of an arcsecond, about 4.848 × 10⁻⁹ radians. It is the working unit of modern astrometry: a parallax of 1 mas corresponds to a distance of one kiloparsec, and the Gaia mission measures positions and parallaxes at this level for over a billion stars.
Watch out: Very long baseline interferometry and Gaia both produce angles this small, but they are measuring different things. A parallax in mas inverts to a distance; a proper motion in mas per year is a transverse velocity that also needs the distance before it means anything in kilometres per second.
| 1 | 2.7777778e-07 |
One milliarcsecond in every angle unit
| 1,000 | microarcsecond (μas) | |
| 1 | milliarcsecond (mas)this unit | |
| 0.00484814 | microradian (μrad) | |
| 0.001 | arcsecond (″) | |
| 0.0000166667 | arcminute (′) | |
| 0.00000493827 | mil (NATO) (mil) | |
| 0.00000484814 | milliradian (mrad) | |
| 3.08642e-07 | gradian (gon) | |
| 2.77778e-07 | degree (°) | |
| 2.46914e-08 | compass point (point) | |
| 1.85185e-08 | hour angle (h) | |
| 4.84814e-09 | radian (rad) | |
| 3.08642e-09 | quadrant (quad) | |
| 7.71605e-10 | revolution (rev) |
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