The plural of dayside, referring to the side of a planet or celestial body that faces toward the sun.
Composed of 'day' (Old English 'dæg') and 'side' (Old English 'sīde'). This modern astronomical term emerged in the 20th century to describe the illuminated hemisphere of a tidally-locked planet.
Mercury and Venus experience extreme temperatures on their daysides because they're so close to the sun—Mercury's dayside reaches 800°F while its night side freezes at -290°F, the most extreme temperature swings in our solar system!
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