From 1609 till his death.
Modern astronomy.
Galileo !
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 and Ptolemy
Urania - Goddess of Space, Astronomy, and Astrology.
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.
Galileo Galilei
Modern astronomy.
Astronomy
yes.
In astronomy, he used a telescope.
Yes
astronomy and philosophy.
Astronomy/physics
Galileo
Galileo !
in ancient greece the person that invented astronomy was the great galileo