Creation

That depends on how you define "day". Day is not a standard unit of time.

Pedantically, "day" is a non-SI unit that is accepted for use with SI units. https://physics.nist.gov/cuu/Units/outside.Html.

Hi Jon, So time that we have been talking about is a concept of man that he has devised to measure the duration between events in existence.God Bless,

The moon doesn't have a watch either, but takes so much time to orbit. The issue of exactly how poor little mankind marks time is not so important. It still exists the same. To claim time is nothing but the way man marks time is actually foolish.

Hi creation, Why would the moon need a watch? It is in it's orbit around the earth, and has nothing to do with the revolution of the earth relative to the sun.How do you mark time? Time is what is used to measure duration between events in eternity.Time does not exist. It is not an object, that can be measured. It is not a dimension of the universe. If it was you should be able to measure it with length, width, height or depth.But what we call time is what we use to measure the duration between events in the universe (existence).

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1.
the indefinite continued progress of existence and events in the past, present, and future regarded as a whole.
"travel through space and time"
the progress of time as affecting people and things.
"things were getting better as time passed"
time or an amount of time as reckoned by a conventional standard.
"it's eight o'clock Eastern Standard Time"
the personification of time, typically as an old man with a scythe and hourglass.
noun: Time; noun: Father Time
2.
a point of time as measured in hours and minutes past midnight or noon.

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definition of time - Google Search

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Definition of time
1 a : the measured or measurable period during which an action, process, or condition exists or continues : duration
b : a nonspatial continuum that is measured in terms of events which succeed one another from past through present to future

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Short Definitions
what clocks measure (attr. to physicists Albert Einstein, Donald Ivey, and others)
what prevents everything from happening at once (physicist John Wheeler and others)
a linear continuum of instants (philosopher Adolf Grnbaum)
a certain period during which something is done (Medical Dictionary)
a continuum that lacks spatial dimensions (Encyclopaedia Britannica)
Although each of these definitions is fine as far as it goes, none of them feel wholly satisfactory. Dictionary Definitions
Various dictionaries have defined time as follows:
the indefinite continued progress of existence and events in the past, present and future regarded as a whole (Oxford Dictionary)
the measured or measurable period during which an action, process or condition exists or continues (Webster’s Collegiate Dictionary)
the continuous passage of existence in which events pass from a state of potentiality in the future, through the present, to a state of finality in the past (World English Dictionary)
a continuous, measurable quantity in which events occur in a sequence proceeding from the past through the present to the future (Science Dictionary)
the measured or measurable period during which an action, process or condition exists or continues (Merriam-Webster Dictionary)
the dimension of the physical universe that orders the sequence of events at a given place (McGraw-Hill Encyclopedia of Science and Technology)
a non-spatial system in which events appear to happen in irreversible succession (WordSmyth Dictionary)
the inevitable progression into the future with the passing of present events into the past (Wiktionary)
the indefinite continued progress of existence and events in the past, present, and future regarded as a whole (Google)

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Time standards based on Earth rotation.
Apparent solar time ('apparent' is often used in English-language sources, but 'true' in French astronomical literature[3]) is based on the solar day, which is the period between one solar noon (passage of the real Sun across the meridian) and the next. A solar day is approximately 24 hours of mean time. Because the Earth's orbit around the sun is elliptical, and because of the obliquity of the Earth's axis relative to the plane of the orbit (the ecliptic), the apparent solar day varies a few dozen seconds above or below the mean value of 24 hours. As the variation accumulates over a few weeks, there are differences as large as 16 minutes between apparent solar time and mean solar time (see Equation of time). However, these variations cancel out over a year. There are also other perturbations such as Earth's wobble, but these are less than a second per year.
Sidereal time is time by the stars. A sidereal rotation is the time it takes the Earth to make one revolution with rotation to the stars, approximately 23 hours 56 minutes 4 seconds. For accurate astronomical work on land, it was usual to observe sidereal time rather than solar time to measure mean solar time, because the observations of 'fixed' stars could be measured and reduced more accurately than observations of the Sun (in spite of the need to make various small compensations, for refraction, aberration, precession, nutation and proper motion). It is well known that observations of the Sun pose substantial obstacles to the achievement of accuracy in measurement.[4] In former times, before the distribution of accurate time signals, it was part of the routine work at any observatory to observe the sidereal times of meridian transit of selected 'clock stars' (of well-known position and movement), and to use these to correct observatory clocks running local mean sidereal time; but nowadays local sidereal time is usually generated by computer, based on time signals.[5]
Mean solar time was originally apparent solar time corrected by the equation of time. Mean solar time was sometimes derived, especially at sea for navigational purposes, by observing apparent solar time and then adding to it a calculated correction, the equation of time, which compensated for two known irregularities, caused by the ellipticity of the Earth's orbit and the obliquity of the Earth's equator and polar axis to the ecliptic (which is the plane of the Earth's orbit around the sun).
Greenwich Mean Time (GMT) was originally mean time deduced from meridian observations made at the Royal Greenwich Observatory (RGO). The principal meridian of that observatory was chosen in 1884 by the International Meridian Conference to be the Prime Meridian. GMT either by that name or as 'mean time at Greenwich' used to be an international time standard, but is no longer so; it was initially renamed in 1928 as Universal Time (UT) (partly as a result of ambiguities arising from the changed practice of starting the astronomical day at midnight instead of at noon, adopted as from 1 January 1925). The more current refined version of UT, UT1, is still in reality mean time at Greenwich. Greenwich Mean Time is still the legal time in the UK (in winter, and as adjusted by one hour for summer time). But Coordinated Universal Time (UTC) (an atomic-based time scale which is always kept within 0.9 second of UT1) is in common actual use in the UK, and the name GMT is often inaccurately used to refer to it. (See articles Greenwich Mean Time, Universal Time, Coordinated Universal Time and the sources they cite.)
Universal Time (UT) is mean solar time at 0 longitude; some implementations are
UT0 is the rotational time of a particular place of observation. It is observed as the diurnal motion of stars or extraterrestrial radio sources.
UT1 is computed by correcting UT0 for the effect of polar motion on the longitude of the observing site. It varies from uniformity because of the irregularities in Earth's rotation.

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Time standard - WikipediaMy conclusions:There is existence.
There are events in this existence.
These events have duration between them.
We measure this duration with a human invention called time.Time is a concept developed by mankind to measure the duration between events in existence (eternity).Since it is man's concept he gets to determine what that concept is based upon. There are several mentioned above. Most of which are based upon the rotation on the earth relative to the sun or stars.If you got a better definition share it with us.God Bless,

No, time exists. The units in which we choose to measure it are arbitrary. As are all the other fundamental units we use; length, mass, electric current, temperature, amount of a substance (Avogadro's number), and luminous intensity.The map (seconds, minutes, hours,...) is not the territory (time) Edited by JonF, : No reason given.

Hi ringo, If it is all in my eye seeing the red in the red ochres how do they make red dye out of red ochres that can make a white piece of cloth look like it is red?God Bless,

As I said, under different lighting conditions it won't always appear as red. Shine a red light on a white coth and your eye/brain will see the same red. There is no "red" in the cloth. "Red" is the length of the light wave, a property of the light.

So, the 4 dimensions are length, width, height and depth? I think you forgot here, now, then, and over there. Edited by Tanypteryx, : No reason given.

Blonde joke:ICANT says to his blonde assistant, "We need to measure the height of this flagpole but I can't figure out how to get up there."The blonde takes a wrench, undoes a couple of bolts and lays the flagpole down on the ground. Then she takes a tape measure, stretches it out and announces, "Fourteen feet and eight inches."ICANT stands there shaking his head, "Typical blonde. I ask her for the height and she gives me the length."

Hi Jon, I don't see any problem in determining the rotation of the earth relative to the sun. You just use the equator as the point for comparison.I think it is 3 minutes less than 24 hours. The Egyptians used the base 12 number rather than our base 10 number as they liked the base 12. Base 12 has a larger number of integer factors than 10. They are 12/6=2, 12/4=3, 12/3=4, 12/2=6, while 10/5=2 and 10/2=5 are all there are for the number 10).The Egyptians only divided the light period and dark period into 24 hours. Twelve hours of light and twelve hours of darkness. The first minute and second minute began to be used in 150 AD. Minutes and seconds was not used until the first mechanical clocks that displayed minutes appeared near the end of the 16th century. But even today some time pieces do not display seconds.Where I live we have 14 hours 6 minutes and 49 seconds of light on the longest day of the year. On the shortest day of the year we have 10 hrs 10 minutes and 53 seconds of light.To the Egyptians that would have been 12 hrs of light and 12 hrs of darkness. So their hours did not contain 60 minutes every hour.This changed in 1967, when the second was redefined as the duration of 9,192,631,770 energy transitions of the cesium atom.But this created a problem, in order to keep atomic time in agreement with astronomical time, leap seconds occasionally must be added to UTC.Time would become useless if the clock's did not match reality.God Bless,

Hi Jon, The earth revolves at near 1,000 mph at a point near the equator. This line is the only one that would take the most duration in the revolution. As you move away from the equator either north or south the amount of time and speed would reduce.Therefore to talk about a 24 hour day you have to talk about what transpires at or near the equator.So what is the problem with determining the duration of a day?God Bless,

Hi Jon, So you don't know.cavediver and Son Goku both have stated on this web site "we don't know".There is no scientific book that address the origin of the universe or life. If you know of one I would like a reference.There have been proposals put forward with no evidence.
Those proposals have no more weight than the Bible story of creation. In fact I believe they have a lot less because the Bible does make prediction that has been discovered l,000's of years after they were made. Those proposals have nothing.But maybe you have something new you can point me too.ABE Have you read Message 1 If not why not discuss it with me I noticed you have not replided to it.God Bless,Edited by ICANT, : Add link

Hi ringo, I prefer God's definition found in Genesis 1:5.

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And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.

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A period of light was called Day.
The evening of that light period and the following dark period were declared Day one.So my definition of Day would be a light period.Also a light period followed by a dark period would be called a day.God Bless,

So, I'm in a lab in Sheboygan, Wisconsin and running an experiment that requires timing to femtosecond precision. How do I ensure my femtosecond is exactly everyone else's femtosecond.(This sort of thing happens, except for the location. It's difficult to do using atomic clocks because you have to account for relativistic effects from differences in altitude and velocity).Oh, and, that equator is the celestial equator, not the Earth's equator. Thank you for acknowledging that I am correct saying that the choice of units is arbitrary and done for convenience. BTW, 60 comes from the Babylonians. It has more divisors than 10 or 12.While looking stuff up I found Wikipedia: hour. It mentions the ancient Chinese system of dividing the day into 100 marks, the Southeast Asian system of four quarters in the day and each divided into six hours (so the we would call their first hour of the first day quarter our 7 AM), and the Hindus in India:

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The Vedas and Puranas employed units of time based on the sidereal day (nakṣatra ahorātram). This was variously divided into 30 muhūtras of 48 minutes each or 60 dandas or nads of 24 minutes each.[40] The solar day was later similarly divided into 60 ghaṭiks of about the same duration, each divided in turn into 60 vinadis.[40] The Sinhalese followed a similar system but called their sixtieth of a day a peya.

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The rest of what you write is true but irrelevant to the arbitrariness of our choices of units. Except: The variable-length hour was discarded long, long ago except for some Jewish ceremonial applications. The history of the second is more complex than that.Seconds first appeared in the mechanical clocks of the late 16th century. Accurate measurement of seconds didn't show up until Huygens' pendulum clock in the mid-17th century. Nobody cared much about precise and available standards until the 19th century, but by then the second was pretty widely recognized as 1/86,400 of a mean solar day. This was formalized in 1940. But even then better standards were desirable. In 1956 the second was defined as 1/31,556,925.9747 of the tropical year for 1900 January 0 at 12 hours ephemeris time because the Earth's orbit around the Sun is more stable than the Earth's rotation, and this was adopted internationally in 1960. Then there was the current definition seven years later. Some day the second will probably be redefined by optical lattice clocks.There are actually three slightly different systems in use; which one you use is decided by convenience. From Wikipedia's article on seconds :

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A set of atomic clocks throughout the world keeps time by consensus: the clocks "vote" on the correct time, and all voting clocks are steered to agree with the consensus, which is called International Atomic Time (TAI). TAI "ticks" atomic seconds.[4]

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Civil time is defined to agree with the rotation of the earth. The international standard for timekeeping is Coordinated Universal Time (UTC). This time scale "ticks" the same atomic seconds as TAI, but inserts or omits leap seconds as necessary to correct for variations in the rate of rotation of the earth.[5]

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A time scale in which the seconds are not exactly equal to atomic seconds is UT1, a form of universal time. UT1 is defined by the rotation of the earth with respect to the sun, and does not contain any leap seconds.[6] UT1 always differs from UTC by less than a second.

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