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book by Johannes Kepler
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The Epitome Astronomiae Copernicanae is an astronomy book on the heliocentric system published by Johannes Kepler in the period 1618 to 1621. The first volume was printed in 1618, the second in 1620, and the third in 1621.
“Astronomers should not be granted excessive license to conceive anything they please without reason: on the contrary, it is also necessary for you to establish the probable causes of your Hypotheses which you recommend as the true causes of the Appearances. Hence you must first establish the principles of your Astronomy in a higher science, namely Physics and Metaphysics.”
Quotes via Wikiquote (CC BY-SA), each with its original source.