Processed here to black and white, it is remarkably similar to Thobern Bergman’s rendering of the black-drop effect that he observed during the 1761 transit of Venus (inset). Credit: Roy Parish. In this column in January 2018, I wrote about black-drop effects that appear with sunspots during a solar eclipse. From near Shreveport, Louisiana, Roy Parish witnessed a 95-percent occultation, which he imaged through a 4-inch Maksutov-Cassegrain and a QHY 5PII-C eyepiece camera. I am not aware of any published accounts of an “inverse black-drop effect” observed during a lunar occultation.

Source: The North Africa Journal July 28, 2023 02:09 UTC