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§ 81]
The Arrangement of the Solar System
107
the sun, the order of distance Mercury, Venus, Earth, Mars, Jupiter, Saturn being also in accordance with the rates of motion round the sun, Mercury performing its revolution most rapidly (in about 88 days[1]), Saturn most slowly (in about 30 years). On the Coppernican system
Fig. 40.—The solar system according to Coppernicus. From the De Revolutionibus.
the moon alone still revolved round the earth, being the only celestial body the status of which was substantially
- ↑ In this preliminary discussion, as in fig. 40, Coppernicus gives 80 days; but in the more detailed treatment given in Book V. he corrects this to 88 days.
