TIL of the Cyanometer - created in the 1760’s to measure the “blueness” of the sky.

i.redd.it

TIL of the Cyanometer - created in the 1760’s to measure the “blueness” of the sky.

i.redd.it

Lemmit.Online bot

MAB to sailing ~ explore, dream, discover ~~ _/)_/)_/)~~English · 1 day ago

This is an automated archive made by the Lemmit Bot.

The original was posted on /r/sailing by /u/Brandgeek on 2025-06-16 20:47:51+00:00.

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