Eliminating the Coriolis effect in liquid mirrors

If uncorrected, the Coriolis force due to the rotation of the Earth causes significant aberration of images produced by large liquid-mirror telescopes . We show that this problem can be eliminated by a fixed compensating tilt of the liquid-mirror rotation axis. The required tilt angle, which is a fun ction of latitude and the mirror rotation rate, is on the order of 10 " for current telescopes. This result removes the last fundamental obstacle to a chieving diffraction-limited performance with large liquid mirrors.