Astronomy college course/Astronomy (wikipedia)/Quiz01/1

1. When did astronomy split between theoretical and observational branches? -- In the 20th century.

Sample short answer
An easy way to remember this is to realize that before the 20th century, astronomy was considered a part of mathematics, and dealt with solving Newton's equations of motion. It wasn't until the 20th century that the theory of atoms and was developed to the point where physicists could study the light from stars and deduce the conditions under which that light was created.--Guy vandegrift (discuss • contribs) 01:50, 2 January 2016 (UTC)

Why don't you ask the students to explain the difference between the two?--Ah2559 (discuss • contribs) 18:56, 25 January 2016 (UTC)