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Galileo's Sketches 

Galileo's sketches of the moon.

Compared to modern photos:

Galileo's sketches showing the movement of Jupiter's moons.

Note the numbering.

Another drawing of Jupiter and moons

A simple drawing of the Pleiades - an easy-to-find constellation. Note how Galileo indicates the major stars by drawing them larger. Also, this shows how we began to understand how many more stars were visible through a telescope than with the unaided eye because of the light-gathering capabilities of the "objective lens."

For comparison, here are modern photos of the same stars.

Same constellation with individual stars named:

Just for fun:

Astronomer/artist Chesley Bonestell's famous painting of Pleione, flattened because of extreme rotation speed.