To mark tomorrow's rare Chunghwa Post is offering a set of four and a souvenir sheet to help people understand the phenomena. H/T ! https://t.co/4D5W0GNRyL https://t.co/TuUwDZjqjW

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This map charts the path of the April 25th, 1846 which was visible across most of the contiguous United States!

See the full map here: https://t.co/kWHKITaNOU

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