For Further Exploration: Orbits and Gravity


Brahe and Kepler

Christianson, G. "The Celestial Palace of Tycho Brahe." Scientific American (February 1961): 118.

Gingerich, O. "Johannes Kepler and the Rudolphine Tables." Sky & Telescope (December 1971): 328. Brief article on Kepler’s work.

Wilson, C. "How Did Kepler Discover His First Two Laws?" Scientific American (March 1972): 92.


Christianson, G. "Newton’s Principia: A Retrospective." Sky & Telescope (July 1987): 18.

Cohen, I. "Newton’s Discovery of Gravity." Scientific American (March 1981): 166.

Gingerich, O. "Newton, Halley, and the Comet." Sky & Telescope (March 1986): 230.

Sullivant, R. "When the Apple Falls." Astronomy (April 1998): 55. Brief overview.

The Discovery of Neptune

Sheehan, W., et al. "The Case of the Pilfered Planet: Did the British Steal Neptune?" Scientific American (December 2004): 92.


Brahe and Kepler


  • Sir Isaac Newton: MacTutor article with additional links.
  • Sir Isaac Newton: Newton Biography at the Luminarium.

The Discovery of Neptune


Brahe and Kepler

"Harmony of the Worlds." This third episode of Carl Sagan’s TV series Cosmos focuses on Kepler and his life and work.

Tycho Brahe, Johannes Kepler, and Planetary Motion: German-produced video, in English (14:27)


Beyond the Big Bang: Sir Isaac Newton’s Law of Gravity: From the History Channel (4:35)

Sir Isaac Newton versus Bill Nye: Epic Rap Battles of History: (2:47)

The Discovery of Neptune

Richard Feynman: On the Discovery of Neptune: A brief black-and-white Caltech lecture (4:33)

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