And was it different 2000 years ago? 10000? Will it be different 4000 years from now. If so, much differnet for all?
The Earth’s day has increased in length over time. The original length of one day, when the Earth was new about 4.5 billion years ago, was about six hours as determined by computer simulation. It was 21.9 hours 620 million years ago as recorded by rhythmites (alternating layers in sandstone). This phenomenon is due to tides raised by the Moon which slow Earth’s rotation. Because of the way the second is defined, the mean length of a day is now about 86,400.002 seconds, and is increasing by about 1.7 milliseconds per century (an average over the last 2700 years).
A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours (86,400 seconds). As a day passes at a given location it experiences morning, noon, afternoon, evening, and night. This daily cycle drives circadian rhythms in many organisms, which are vital to many life processes.
A collection of sequential days is organized into calendars as dates, almost always into weeks, months and years. A solar calendar organizes dates based on the Sun's annual...
ETA: Doh! Gotta work on my speed searching.
What’s three minutes among friends?
You might want to consider the sidereal day which is purely the amount of time it takes the Earth to make one revolution on it’s axis, 23h 56m 4.090530833s according to Wikipedia . That’s the number that has been varying over the last 4.5 billion years as the Earth’s revolutions have slowed. The other 4-ish minutes are due to the Earth moving relative to the sun, which is a separate issue.
