Difference between revisions of "April 25, 2009"
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<em>image by [mailto:jfigueroab33@yahoo.com Jorge Figueroa], Guatemala City, Guatemala</em><br /> | <em>image by [mailto:jfigueroab33@yahoo.com Jorge Figueroa], Guatemala City, Guatemala</em><br /> | ||
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| − | In 1610 when Galileo made humanity's first telescopic observation of Venus he followed the planet long enough to see it change its shape. He realized that it was exhibiting phases, just as the Moon does. This was perhaps Galileo's most important discovery for solar system science because it disproved the Ptolemaic theory that Venus was always between Earth and Sun. Galileo recognized from his discovery of [mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | + | In 1610 when Galileo made humanity's first telescopic observation of Venus he followed the planet long enough to see it change its shape. He realized that it was exhibiting phases, just as the Moon does. This was perhaps Galileo's most important discovery for solar system science because it disproved the Ptolemaic theory that Venus was always between Earth and Sun. Galileo recognized from his discovery of [http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galileo.htm Venus' phases] that sometimes Venus was on the opposite side of the Sun from the Earth. Copernicus was right*, Ptolemy was wrong and Galileo proved it. <br /> |
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| + | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
*Tycho's theory of the solar system was wrong, but in it Venus showed phases. <br /> | *Tycho's theory of the solar system was wrong, but in it Venus showed phases. <br /> | ||
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Revision as of 19:39, 1 January 2015
Twin Crescents, Critical Observation
image by Jorge Figueroa, Guatemala City, Guatemala
In 1610 when Galileo made humanity's first telescopic observation of Venus he followed the planet long enough to see it change its shape. He realized that it was exhibiting phases, just as the Moon does. This was perhaps Galileo's most important discovery for solar system science because it disproved the Ptolemaic theory that Venus was always between Earth and Sun. Galileo recognized from his discovery of Venus' phases that sometimes Venus was on the opposite side of the Sun from the Earth. Copernicus was right*, Ptolemy was wrong and Galileo proved it.
Chuck Wood
- Tycho's theory of the solar system was wrong, but in it Venus showed phases.
Technical Details
This is the first LPOD from Guatemala!
April 22, 2009, 5:33. Canon XTi, 1/80sec, ISO 200, prime focus at Takahashi FS 78 Refractor.
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