moon pillar

moon pillar

[′mün ‚pil·ər]
(meteorology)
A halo consisting of a vertical shaft of light through the moon.
References in periodicals archive ?
Sun and Moon pillars are vertical glowing columns above (or sometimes below) a low Sun or Moon, caused by reflection of light off the horizontal faces of floating ice crystals.
When tiny, hexagonal ice crystals float horizontally in the air, "Moon pillars" and "light pillars" can extend up and down from the Moon and from streetlights, too.
In a coming issue I will discuss Moon pillars and light pillars.