"Astronomy classes" refers to educational courses or lessons that teach students about the study of celestial objects, such as stars, planets, galaxies, and other celestial phenomena. Full definition
However, in an effort to get some of her distribution requirements out of the way early, she took a history of astronomy class during her freshman year and was hooked. (sciencemag.org)
If you take a basic astronomy class you can get the answer to that question. (religion.blogs.cnn.com)
Within hours of their Sept. 12 arrival at the 20 - acre mountaintop campus, the pupils were learning to identify the stars in astronomy class and studying their body rhythms in the chronobiology labs, set up to examine patterns of waking and... (edweek.org)