Stock Photo - Astronomicum Caesareum, May 1540, Hand-colored woodcuts, 17 7/8 × 12 11/16 × 1 5/16 in. (45.4 × 32.3 × 3.3 cm), Books, Michael Ostendorfer (German, (?) ca. 1490–1549 Regensburg), This most sumptuous of all Renaissance instructive manuals explained the use of the astrolabe (for calculating the altitude of stars) and other instruments used for computing planetary positions. The author, court astronomer to Emperor Charles V, also provided new observations on the comet of 1531 (Halley's Comet)

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