Astronomers do it in the dark. Astronomers do it in voids. Astronomers do it on mountain tops. Astronomers do it orbitally. Astronomers do it parabolically.
Astronomers do it spectroscopically.
Astronomers do it telescopically. Astronomers do it under the stars. Astronomers do it universally. Astronomers do it variably. Astronomers do it while gazing at Uranus.