horizon light

horizon light

A lighting unit used to illuminate a cyclorama from below, e.g., from a light trough.
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21:44-01:06 UT, faint horizon light at Kelso, Co Mayo & the Derry coast, faint arc & weak rays at St Andrews.
Geoff Chester of the US Naval Observatory explained that when the low-hanging moon near the horizon lights through trees, buildings, and other objects in the foreground, it intensifies the illusion in a perigee moon making it appear unnaturally large.