Southeast limb, showing the “Lunar X”

IDL TIFF file

Andrew Houghton

Nottinghamshire

SkyWatcher Evostar 120mm refractor on EQ5 mount. Canon EOS 60D camera. Images stacked and processed using AviStack.

A view of the southeast limb of the Moon, showing (at left, on the terminator) the “Lunar X”, which is seen when the walls of the craters Blanchinus, La Caille and Purbach are illuminated by the Sun. The Lunar X is only visible for 4 hours in each lunar cycle.

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