Reaching for the Stars
summary
Shows how Uranus orbital perturbations let independent 1845 calculations predict an unseen planet then observed in 1846 about one degree off the prediction, explains discovery of helium in 1896 by matching an unknown spectroscopic line in the solar spectrum, and demonstrates stellar parallax giving 61 Cygni a calculated distance of ~10.4 light years versus a later value near 11.4 light years, and cites Eratosthenes measuring Earth’s circumference within ~1%.
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