An Astronomical Disputation on the Three Comets
Time: 1619
Place: Italy
Details: Because The Assayer contains such a wealth of Galileo's ideas on how science should be practised, it has been referred to as his scientific manifesto. Early in 1619, Father Grassi had anonymously published a pamphlet, An Astronomical Disputation on the Three Comets of the Year 1618, which discussed the nature of a comet that had appeared late in November of the previous year. Grassi concluded that the comet was a fiery body which had moved along a segment of a great circle at a constant distance from the earth, and since it moved in the sky more slowly than the Moon, it must be farther away than the Moon.
‹ Earlier in historySir Walter Raleigh was executedMonday Oct 29, 1618 Later in history ›The modern Thanksgiving holiday tradition1619
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