Improved astronomical observation is enabling us to spot many more asteroids.
Times, Sunday Times (2008)
His finding was taken up shortly before 1600, when a great surge of astronomical observation began, from Italy to Scandinavia.
World History: Patterns of Change and Continuity (1995)
It's hard to take astronomical observations in a constantly cloudy sky.
Tuning the Rig: A Journey to the Arctic (1990)