Wiktionary:Word of the day/2025/April 21

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Word of the day
for April 21
astrognosy n
  1. (astronomy, archaic) Knowledge of the stars, especially the fixed stars; the branch of astronomy dealing with the fixed stars.

Today is the start of International Dark Sky Week in 2025. Founded in 2003 by high school student Jennifer Barlow of Midlothian, Virginia, U.S.A., it takes place during the week of the new moon in April, and people are encouraged to turn off lights to observe the night sky without light pollution.

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