30 March
239 BC: On 30 March 239 BC, the first recorded passage of Halley's Comet was observed by Chinese astronomers in the Shih Chi and Wen Hsien Thung Khao chronicles.
02 FEB. 2005
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1997: On 31 March 1997, Lyman Spitzer died.
Spitzer was an American astrophysicist who advanced knowledge of physical processes in interstellar space and pioneered efforts to harness nuclear fusion as a clean energy source.
Spitzer was the first person to propose the idea of placing a large telescope in space and was the driving force behind the development of the Hubble Space Telescope.
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29 March
1974: On 29 March 1974, the first probe to Mercury, Mariner 10, arrived at the planet.
28 March
1807: On 28 March 1807, Vesta 4, the only asteroid visible to the naked eye, thus the brightest on record, was first observed by the German astronomer Heinrich Wilhelm Olbers.
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