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https://www.timeanddate.com/time/earth-rotation.html#:~:text=Modern%20timekeeping%20defines%20a%20day%20as%20the%20sum,Earth%27s%20rotation%20because%20of%20friction%20produced%20by%20tides.
https://www.timeanddate.com/time/earth-rotation.html
This is the time it takes Earth to rotate 19.75 cm (7.78 in), as measured at the equator. This means that today lasts: 23.9999998820 hours or. 24 hours minus 0.42 ms. On average, a mean solar day in the last 365 days was -0.19 ms under …
https://ferdbre.annapellissari.com/is-a-day-exactly-24-hours-21/
In the 24-hour time notation, the day begins at midnight, 00:00, and the last minute of the day begins at 23:59. Where convenient, the notation 24:00 may also be used to refer to midnight at the end of a given date — that is, 24:00 of one day is the same time as 00:00 of the following day.
https://www.quora.com/Are-there-exactly-24-hours-in-a-day
Yes. Originally, the day was split up into 24 hours, each hour into 60 minutes, and each minute into 60 seconds. However, currently the second is defined so as to have a fixed length - so if Earth’s rotation changes - as indeed it does - then the number of seconds in a day will vary slightly.
http://blog.keithw.org/2013/02/q-if-one-day-is-not-exactly-24-hours.html
Let's do the math: One sidereal day is 23 hours, 56 minutes, 4 seconds, or 86164 seconds. Multiply this by 366.25 sidereal days in a year, and you get 31557565 seconds. Divide by 365.25 solar days, and we get that a solar day is.... 86,400 seconds. That's 24 hours exactly! It's this "mean solar day" (24 hours) that is the normal definition of day.
https://physics.stackexchange.com/questions/469869/how-can-a-day-be-exactly-24-hours-long
The longest solar day of year is approximately 24 hours 0 min 30 seconds (occurs at mid to late December) while the shortest solar day of year is approximately 23 hour 59min 38 seconds. If I average out both of these I come up with average solar day of 24 hour +4seconds. Why then it is said it is 24 hours 0min 0 seconds exactly??
https://math.answers.com/Q/How_many_hours_exactly_are_in_a_day
A day is defined by the scientific community as 86400 seconds (which also happens to be 24 hours). A solar day is not exactly 24 hours which is why leap seconds are added to certain days. To...
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