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  1. Greg Egan (gregegansf@mathstodon.xyz)'s status on Sunday, 10-Sep-2023 16:55:17 UTC Greg Egan Greg Egan

    TIL about Rjukan, a Norwegian town in a valley that receives no sunlight in winter, but built mirrors to bring some in.

    Some peaks on the moon get sunlight for 90% of the year [https://skyandtelescope.org/sky-and-telescope-magazine/peaks-of-eternal-light/], but year-round light on Earth would need a 540km-high mountain at the south pole.

    https://www.theguardian.com/world/2013/nov/06/rjukan-sun-norway-town-mirrors

    In conversation about a year ago from mathstodon.xyz permalink
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