# Lunar X

> 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

**Wikidata**: [Q426943](https://www.wikidata.org/wiki/Q426943)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Lunar_X)  
**Source**: https://4ort.xyz/entity/lunar-x