Early Astronomy in the University of Michigan Collections

The Lunar Eclipse

This hand-colored woodcut illustrates a discussion about measuring the time of a lunar eclipse, described as minutes of immersion (minuta casus), which are equivalent to the minutes of the zodiac that the Moon traverses in exceeding the Sun in speed from the beginning of the eclipse to the middle of it, if the eclipse is partial or total without delay, or from the beginning until total darkness if it is total with delay. The minutes of half the delay are the minutes of the zodiac traversed by the Moon in exceeding the speed of the Sun from the beginning of total darkness until the middle of the eclipse.

Georg Peurbach

Pre-Copernican Astronomy

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