The period of darkness and faint light in the sky opposite to the direction of the sun's position, or illumination opposite to twilight conditions.
From anti- (opposite) + twilight (the dim light at sunrise or sunset, from Middle English twi- meaning two + light). This rare astronomical term describes light conditions in the opposite sky hemisphere.
Antitwilight is a hidden sky phenomenon—while sunset creates beautiful orange twilight in the west, the opposite eastern sky simultaneously shows a fainter blue-gray anti-twilight band that most people never notice.
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