I believe that at the time of Galileo and other pioneers in astronomy there was no formal astronomy study; he (and others) must have learned most of what they knew by themselves.
yes.
Some of Galileo's most significant work was in the field of kinematics, identifying that the total ...by him (or to be written by him) were forbidden, though this latter part was not enforced. ... Galileo Galilei - major areas of study ...
Galileo.
astronomy,mathematics,physics and philosophy
Philosophy, astronomy, and physics.
Galileo Galilei
Astronomy
Modern astronomy.
Yes
In astronomy, he used a telescope.
astronomy and philosophy.
From 1609 till his death.