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Solar terminator line

The terminator is the locus of points on a moon or planet where the line through the sun is tangent. It is the boundary between day and night and moves around the planet as it rotates.

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1904

... Ancel Keys, scientist February 1 - S. J. Perelman[?], humorist, author February 4 - MacKinlay Kantor[?], historian (+ 1977) February 5 - Walter Gross[?], cabaretist ...