Black drop effect
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The black drop effect is an optical phenomenon visible during a transit of Venus and, to a lesser extent, a transit of Mercury.
Venus transits the face of the Sun on 8 June 2004. Here, the black drop effect is visible.
The black drop effect as observed by Captain James Cook and Charles Green in 1771.
The black drop effect in 2004, in moments of "bad" seeing (left) and "good" seeing (right).
Astronomical transit
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In astronomy, a transit is the passage of a celestial body directly between a larger body and the observer. As viewed from a particular vantage point, the transiting body appears to move across the fa
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's disc to the limb of the Sun, making it…
Transit of Venus as seen from Earth, 2012
Io transits across Jupiter as seen by Cassini spacecraft
The light curve shows the change in Luminosity of star as a result of transiting. The data was collected from the Kepler mission.