microarcsecond
Angleexact by definition
The microarcsecond is a millionth of an arcsecond, about 4.848 × 10⁻¹² radians. It is the frontier of angular measurement: the Event Horizon Telescope resolved structure at roughly 20 μas, and Gaia's best parallaxes for bright stars reach a few tens of μas.
| 1 | 2.7777778e-10 |
Where the unit came from
To make the size concrete, a microarcsecond is roughly the angle subtended by a full stop on the Moon as seen from Earth. Reaching it requires either an interferometer the width of the planet or a spacecraft scanning the sky for years.
One microarcsecond in every angle unit
| 1 | microarcsecond (μas)this unit | |
| 0.001 | milliarcsecond (mas) | |
| 0.00000484814 | microradian (μrad) | |
| 0.000001 | arcsecond (″) | |
| 1.66667e-08 | arcminute (′) | |
| 4.93827e-09 | mil (NATO) (mil) | |
| 4.84814e-09 | milliradian (mrad) | |
| 3.08642e-10 | gradian (gon) | |
| 2.77778e-10 | degree (°) | |
| 2.46914e-11 | compass point (point) | |
| 1.85185e-11 | hour angle (h) | |
| 4.84814e-12 | radian (rad) | |
| 3.08642e-12 | quadrant (quad) | |
| 7.71605e-13 | revolution (rev) |
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