What does black drop effect mean?
Definitions for black drop effect
black drop effect
This dictionary definitions page includes all the possible meanings, example usage and translations of the word black drop effect.
Wiktionary
black drop effectnoun
An optical effect, occurring during the transit of an object in front of the Sun, by which light is bent around the object, causing it to look stretched out
Wikipedia
Black drop effect
The black drop effect is an optical phenomenon visible during a transit of Venus and, to a lesser extent, a transit of Mercury.
Wikidata
Black drop effect
The black drop effect is an optical phenomenon visible during a transit of Venus and, to a lesser extent, a transit of Mercury. Just after second contact, and again just before third contact during the transit, a small black "teardrop" appears to connect Venus' disk to the limb of the Sun, making it impossible to time the exact moment of second or third contact accurately. This led to the failure of the attempts during the 18th century transits of Venus to establish a truly precise value for the astronomical unit. The black drop effect was long thought to be due to Venus' thick atmosphere, and indeed it was held to be the first real evidence that Venus had an atmosphere. However, it is now thought by many to be an optical effect caused by the smearing of the image of Venus by turbulence in the Earth's atmosphere or imperfections in the viewing apparatus. With precise measurements, a black drop effect was observed from outside the Earth's atmosphere during the 1999 and 2003 transits of Mercury, although Mercury has no significant atmosphere. In the 8 June 2004 transit of Venus, many observers reported that they did not see the black drop effect, or at least that it was much less pronounced than had been reported in earlier centuries' transits. Larger telescopes, better optics, and limb darkening may have been a factor.
Numerology
Chaldean Numerology
The numerical value of black drop effect in Chaldean Numerology is: 2
Pythagorean Numerology
The numerical value of black drop effect in Pythagorean Numerology is: 1
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"black drop effect." Definitions.net. STANDS4 LLC, 2024. Web. 26 Apr. 2024. <https://www.definitions.net/definition/black+drop+effect>.
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