Lunar X

Short description: Shadow pattern on the Moon

For the Google-sponsored competition, see Google Lunar X Prize.

Lunar X formation taken January 30, 2012, the formation is off the center towards the right Lunar X and Lunar V recorded on a Skywatcher 150/750 with a ASI294MC Pro on May 29, 2020, in Mainz, Germany

The Lunar X (also known as the Werner X) is a clair-obscur effect in which light and shadow creates the appearance of a letter 'X' on the rim of the Blanchinus, La Caille and Purbach craters of the Moon.[1]

The X is visible only for a few hours before the first quarter,[2][3] slightly below the lunar terminator. Near to the X, the Lunar V is also visible, formed by Ukert crater and several other small craters.[2]

Half waxing moon with inset closeup of Lunar X, used by a 60mm refractor telescope

## References

1. ↑ Rice, Tony. "X marks the moon on Thursday night". WRAL. http://www.wral.com/weather/blogpost/10923597/.
2. ↑ 2.0 2.1 Harrington, Philip S. (2010). Cosmic challenge : the ultimate observing list for amateurs. Cambridge: Cambridge University Press. pp. 1999. ISBN 978-0-521-89936-9.
3. ↑ Chapman, David M.F.. "The Lunar X Files: a fleeting vision near the crater Werner". Willingboro Astronomical Society. http://wasociety.us/Lunar-X.pdf.

## External links

* LPOD articles:
* Wood, Chuck (August 29, 2004). "X Marks the Spot". Lunar Photo of the Day. http://www.lpod.org/archive/LPOD-2004-08-29.htm.
* Wood, Chuck (December 12, 2013). "X Marks the Spot". Lunar Photo of the Day. http://lpod.wikispaces.com/December+12,+2013.
* Wood, Chuck (March 9, 2014). "Xquisite". Lunar Photo of the Day. http://lpod.wikispaces.com/March+9,+2014.
* APOD articles:
* Nemiroff, R.; Bonnell, J., eds. "Lunar X". Astronomy Picture of the Day. NASA. https://apod.nasa.gov/apod/ap.
* Nemiroff, Robert; Bonnell, Jerry (December 10, 2016). "The Lunar X". Astronomy Photo of the Day (APOD). https://apod.nasa.gov/apod/ap161210.html. \- also includes the Lunar V

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