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https://www.worldatlas.com/articles/why-is-a-day-24-hours-long.html
All of these hours were evenly spaced out. This marked the start of the 24-hour day, and it happened in the 2nd century B.C. Hipparchus studied the way the planets rotated …
https://medium.com/everyday-science/a-day-is-and-isnt-24-hours-long-45e4fff8b2b7
A day is 24 hours long, right? Well, yes. And no. It takes the Earth 23 hours, 56 minutes and 4 seconds to rotate but we still experience a 24-hour day. Let's explore why.
https://www.timeanddate.com/time/earth-rotation.html
24.0000001533 hours or; 24 hours and 0.55 ms; On average, a mean solar day in the last 365 days was -0.20 ms under 24 hours, so today's day length is above average. Over this period, 28 days have been longer than today, while 338 have been shorter than today. If every day were as long as today, a leap second would have to be added every 1812.25 ...
https://medium.com/the-philipendium/a-day-is-not-24-hours-c36ee96078c6
If we define a day as one complete spin of the Earth on its axis — a stellar day — then a day is about 4 minutes less than 24 hours. If we define a day as the time between true noon one day ...
http://curious.astro.cornell.edu/our-solar-system/161-our-solar-system/the-earth/day-night-cycle/761-why-is-a-day-divided-into-24-hours-intermediate
However, hours did not have a fixed length until the Greeks decided they needed such a system for theoretical calculations. Hipparchus proposed dividing the day equally into 24 hours which came to be known as equinoctial hours (because they are based on 12 hours of daylight and 12 hours of darkness on the days of the Equinoxes).
https://www.quora.com/Is-a-day-actually-24-hours
Answer (1 of 2): No, a day isn't *exactly* 24 hours. It is approximately 23 hours, 56 minutes, though that is still not exact. The length of the day depends on how you choose to define a day. For example, a true Solar Day is the time from noon to noon, and varies day to day - being longer durin...
https://convertoctopus.com/24-hours-to-days
An hour (symbol: h; also abbreviated hr.) is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. The seasonal, temporal, or unequal hour was established in the ancient Near East as 1⁄12 of the night or daytime.
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