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33b. Comparison of Taurus region in Lalande edition of Flamsteed, Atlas celeste, 1795 (left), with the same region in the Fortin edition, 1776 (right)

Notice that the M1, the Crab Nebula, appears by the lower horn of Taurus in the 1795 atlas at left, but not in the earlier Fortin atlas at right, which was published before Messier's catalog of the nebulae appeared in 1781.