Hipparchus (c.190-c.120 BC), Ancient Greek astronomer. Hipparchus is considered one of the greatest astronomers of antiquity. He calculated the length of the year and discovered the precession of the equinoxes. It is thought that the later work of Ptolemy was based on the work done by Hipparchus. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Brown, Gary |
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