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The Hipparcos satellite measured positions and parallaxes for thousands of stars with enormous accuracy.
A superb essay by Philip Morrison describing early measurements of stellar parallax and contrasting them with Hipparcos. Highly recommended!
Animation of the 150 nearest stars, made using Hipparcos data. Color indicates stellar luminosity: blue stars are above 10 L, yellow stars are between 1 and 10 L, orange stars are between 0.1 and 1 L, and red stars are below 0.1 L.
Homework 9: Finding Distance With Parallax, due 10/25.
Quiz 9: Is The Sun A Star?