Twin suns, along with the dark stars and many moons, are a common element of descriptions of Carcosa. Usually implied to be dim, in common with themes of fading decadence and dying dynasties, they may overlap with the concept of a red sun. According to The Repairer of Reputations, they sink into the lake at sunset; this may simply be a turn of phrase related to line of sight, akin to saying "the sun went down into the sea", but maybe not...

It is possible that this is a reference to the phenomenon known as a sun dog when a second sun appears visible in the sky. For an alternative interpretation of the twin suns falling into a lake, see Fallout and Alchera.

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