See the Lunar X
Put this lunar target on your list in the next few years.
August 21, 2009
In the October issue of Astronomy, I wrote about 12 easy-to-observe lunar targets. One, the Lunar X, is visible only for short periods of time. Astronomy magazine Contributing Editor Alister Ling authored software that gives the times the Lunar X feature will be visible, as well as the locations. He graciously provided this table, which is specific to North America.
The Lunar X, also known as the Purbach or Werner Cross, appears at First Quarter near the terminator between the craters La Caille, Purbach, and Blanchinus. It sits 25° south of the Moon’s equator and dead-center left to right. When the Lunar X is visible, sunrise is occurring over this region. Ohio amateur astronomer Dana Thompson captured this image of the Lunar X January 25, 2007, at 7:33 p.m. EST.
Photo by Dana Thompson
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