Why does the night exist?
Briefly

The existence of day and night is deeply rooted in the Earth's rotation on its axis, leading to complex derivations. The conservation of angular momentum plays a crucial role in the rotation of planets.
Venus showcases a unique scenario where it rotates in the opposite direction to other planets, affecting its day and night durations significantly. This demonstrates that day and night concepts vary among different worlds.
While most planets should rotate on their axes due to the conservation of angular momentum since formation, various factors can alter this rotation, as demonstrated by Venus halting and reversing its rotation.
The duration and concept of day and night can differ across planets, as seen with Venus where a Venusian year is slightly shorter than a Venusian day, showcasing the unique planetary dynamics at play.
Read at english.elpais.com
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