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| Galileo Galilei |
an Italian astronomer and physicist (b.1564--d.1642). |
| Johannes Kepler |
a German astronomer and mathematician (b.1571--d.1630). |
| Nicolaus Copernicus |
a Polish astronomer (b.1473--d.1543). |
| Ptolemaic system |
the cosmographic theory, systematized by the Hellenistic astronomer Ptolemy, according to which all heavenly bodies revolve around the earth, which is fixed at the center of the universe. |
| Ptolemy |
an Alexandrian mathematician, astronomer, and geographer (second century A.D.). [1/2 definitions] |
| stargazer |
an astronomer or astrologer, or anyone who studies the stars. [1/3 definitions] |
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