How to spot the lunar X and V

image via New Scientist

January 21, 2026, 6:00 PM

• •The lunar X and V are fleeting optical illusions on the Moon's surface.
• •They are visible during the first quarter phase when the terminator is in the right spot.
• •Timing depends on your location, with the next viewing opportunities in late January.
• •A telescope is needed, and software can help you check the moon's visibility.

The article discusses the lunar X and V, optical illusions on the Moon's surface visible during the first quarter phase. These features are created by sunlight hitting specific crater rims, appearing as bright X and V shapes. Timing is crucial for observation, varying by location, with the next opportunities in late January and subsequent months. The article advises using a telescope and software like Stellarium to plan viewings, highlighting the luck involved in capturing these fleeting lunar features.

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