Quick Reference

1 The coloured band or bands visible at the edge of the shadow of the Earth. Although normally red only is present, under certain circumstances yellow and green tints may also appear. All are caused by the refraction and selective absorption of sunlight by the atmosphere. Also known as the countertwilight, antitwilight, or antitwilight arch.

2 An alternative name for the gegenschein.

Subjects: Meteorology and Climatology.

Reference entries