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Temple of Amen-Ra at Karnak. The Temple of Amen-Ra at Karnak, Egypt was built so that its main axis points to the sunset at the summer solstice.
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Pythagoras and students develop model of solar system. The model of Pythagoras used circular paths for the celestial bodies and assumed most celestial bodies are spheres
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Comet Halley considered ill omen for King Harold. The appearance of Comet Halley in 1066 was considered an ill omen for Harold, King of England. Later that year Harold was killed in the Norman invasion of England.
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Tycho observes supernova. Tycho's book about his observations of the supernova established his reputation as an astronomer
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Galileo uses telescope for astronomical observations. Galileo didn't invent the telescope but he was among the first to use a telescope to examine the heavens. He carried out important observations of the Sun, Moon, Planets, and Stars.
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Charles Messier prepares list of nebulae. Like other comet hunters, Messier often mistook nebulae for comets. He compiled a list of 103 nebulae as an aid to other comet hunters. This was the first list of nebulae.
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Pierre Simon Laplace proposes stars can produce black holes. Laplace proposed that if a star is so compact that its escape velocity exceeds the speed of light, then not even light can escape from the star.
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Joseph Stefan finds the rate at which a blackbody emits energy. Stefan found that the energy emitted by a blackbody increases as the fourth power of temperature.
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Jacobus Kapteyn uses star counts to map Milky Way. Using star counts, Kapteyn determined that the Sun lay 2000 pc from the center of a flattened galaxy.
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Astronauts Edwin Aldrin and Neil Armstrong land on Moon. On July 20, 1969 Aldrin and Armstrong became the first people to land on the Moon.
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Supernova detected in Large Magellanic Cloud. The supernova, which occurred in one of the nearest galaxies, was the first supernova in almost 400 years that could be seen without the aid of a telescope
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Spacecraft NEAR-Shoemaker makes historic first landing on the asteroid (Eros)
