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en.wikipedia.org/wiki/Day

A day is approximately the period of time during which the Earth completes one rotation around its axis. A solar day is the length of time which elapses between the Sun reaching its ... The exact moment of, and the interval between, two sunrises or sunsets depends on the geographical position (longitude as well as latitude), ...

www.timeanddate.com/time/earth-rotation.html

Modern timekeeping defines a day as the sum of 24 hours – but it's not that simple. Earth's rotation slows down over time. See the exact day length for today,  ...

medium.com/the-philipendium/a-day-is-not-24-hours-c36ee96078c6

Dec 6, 2016 ... This daily progress in the Earth's orbit is almost exact a degree (defined as ... Another way of expressing this idea is that the length of a day ...

blog.keithw.org/2013/02/q-if-one-day-is-not-exactly-24-hours.html

If we were using a sidereal day (1 exact rotation of the earth = 24 hours) ..... Also, the vast differences in the length of a day (sunrise to sunset) based on ones ...

www.universetoday.com/123218/how-long-is-a-day-on-earth-2

Nov 5, 2015 ... I'm going to ask you how long a day is on Earth, and you're going to ... Because of our tidal interactions with the Moon, the length of a day on ...

spaceplace.nasa.gov/days/sp

Day Length. Mercury, 1,408 hours. Venus, 5,832 hours. Earth, 24 hours. Mars, 25 hours. Jupiter, 10 hours. Saturn, 11 hours. Uranus, 17 hours. Neptune, 16 ...

pumas.jpl.nasa.gov/files/04_21_97_1.pdf

Apr 21, 1997 ... Background: The true length of a year on Earth is 365.2422 days, or about ... Julius Caesar instituted the Julian Calendar in which a year has an extra day if its number is ... must consider how exact the value of 365.2422 is.