Johannes Bayer
Cassiopeia
from Uranometria
German: 1603
Hand-colored engraving
15 x 11 inches
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Johannes Bayer's star atlas Uranometria contained a few innovations. It was the
first atlas to
use Greek letters to mark individual stars, a system still in use today.
This system marks the brightest star with the letter alpha, the second brightest with
beta, and so on. It was also the first atlas to show twelve new southern hemisphere
constellations that had recently been discovered by Europeans.