|Lat: 25.0°S, Long: 155.0°W, Diam: 73 km, Depth: km, Rükl: (farside)|
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Frame 39, made by Zond 8, shows Plummer to the left of the grey/white square at the frame's right margin (between the grey/white square and the frame's central cross).
Research: Danny Caes
Henry Crozier Keating; British astronomer (1875-1946).
Don't know if it's the same Plummer as the one mentioned above (Henry Crozier Keating Plummer), but... according to the footnote on page 64 in Volume 1 of T.W.Webb's Celestial Objects for Common Telescopes (chapter VENUS), he (Plummer) concluded from his own observations that the brightness of Venus is (or was) about 9 times more powerful than the brightness of the brightest star in the heavens (Alpha Canis Majoris, aka Sirius). - DannyCaes Jul 18, 2015