People of the Telescope
Thomas Harriot (1560- 1621) was a scientist during the Scientific Revolution who studied optics. He discovered what is now known as Snell's Law of refraction, and studied algebraic equations dealing with optics. He observed the moon using an early telescope.
Galileo Galilei made advancements on the telescope, which he used to observe the moons of other planets, especially Jupiter. He also observed Earth’s moon, and made detailed drawings of it.
Johannes Kepler was an astronomer who used telescopes to precisely observe planets, and collected a great deal of astronomical data. He discovered that that a telescope could also be made by combining a convex objective and a convex ocular.
Christoph Scheiner was an astronomer and mathematician who discovered sunspots using a telescope. He was criticized for stating that the sun was imperfect, and then stated that the sunspots were satellites around the sun.