Within its two volumes were ten "books" covering every subject within astronomy and related to astronomy at the time: the celestial sphere and subjects such as celestial motions, the equator, ecliptic, zodiac, etc. the earth and its size, gravity and pendulum motion, etc. the sun, its size and distance, its motion, observations involving it, etc. the moon, its phases, its size and distance, etc. (detailed maps of the moon as seen through a telescope were included) lunar and solar eclipses the fixed stars the planets and their motions, etc. (representations of each as seen with a telescope were included); comets and novae ("new stars") the structure of the universe—the heliocentric and geocentric theories, etc. calculations related to astronomy.
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