how do we know that 60 seconds is one minute,and there are 24 hours in a day.?

Question

who has told us this fact,and why is a leap year not called a gap year and how do we know this is 2007 yr,if we dont know when cave man was around how did he know what time and what year it was.

Answer 1

I dont believe you have the TIME for these kind of questions ha ha ha ha.

I think its all imagainary. There is no such thing as time and day and night. Its all a dream and we will wake up to nothing.

Answer 2

TIME..

The 12-hour clock can be traced back as far Mesopotamia and Egypt but may also have roots in India. However, the lengths of the ancient hours varied seasonally, always with 12 hours from sunrise to sunset and 12 hours from sunset to sunrise.

The Romans also used a 12-hour clock: the day was divided into 12 equal hours (of, thus, varying length throughout the year) and the night was divided into three watches. The Romans numbered the morning hours originally in reverse.

YEAR...

A year (from Old English gēr) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. By extension, this can be applied to any planet: for example, a "Martian year" is the time in which Mars completes its own orbit.

YEAR 365 DAYS...

We are in 2007, which is 2007 years after Christ, if an event happened before this date, it was known at 10.BC (before Christ)

LEAP YEAR....

A leap year is a year containing an extra day, in order to keep the calendar year synchronised with the astronomical or seasonal year. For example, February would have 29 days on a leap year instead of the usual 28. Seasons and astronomical events do not repeat at an exact number of days, so a calendar which had the same number of days in each year would over time drift with respect to the event it was supposed to track. By occasionally inserting (or intercalating) an additional day or month into the year, the drift can be corrected. A year which is not a leap year is called a common year. In fact, the Earth takes slightly under 365 1/4 days to revolve around the Sun

Answer 3

The cave man's perception of time was based on seasons, the sun and the moon. The actual time such as days,seconds, minutes etc have been worked out mathematically using sophisticated instruments. The reason it is not a gap year is because there is no gap as time in continuous. Leap year because it leaps to a new date which has been put in by man to make up for the day fraction over the 365 days for the earth to go through a full cycle.

Answer 4

We made it up. Mostly because 60 is a number that divides by a lot of different numbers.
Cave men did not know what year it was. Most civilizations only knew what year it was by counting the years a king was in power. The years were marked off by priests who "forecast" the coming of spring and the planting of crops. Until recently the year began in the spring - mostly at or about March 1 or March 20 (look at when the USA president was put in office in the original constitution.)
Everybody knew what time it was by looking at the sun and working from sun rise to sun set.
24 hours probably comes from 12 signs of the zodiac in the night sky and a matching 12 divisions for the day. And 12 divides by 2,3,4,6 and is handy. (See Dozen)

Answer 5

The second is currently defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. A day is defined as the rotation of the earth on its axis. By defining an hour as 60 minutes, and a minute as 60 seconds, a day can be calculated to be approx. 24 hours.

The year is actually A.D. 2007 (or you can consult a Jewish calendar). Before A.D. 1, there was 1 B.C. or B.C.E. (whichever you prefer). The cavemen didn't call it that, of course, because they didn't know when Christ (or the Christian Era, or the Common Era, still depending on your preference) would come around. They probably kept track of time by the seasons.

Answer 6

The Sumerian is the first people to use this system. Their priests made some kind of hourglass, filled with sand, but only have one side and a hole and a bucket below it. The priests measured the sands fall rate into a bucket in a day and divide the sand inside the bucket into 24 jars, so one jar of sand means an hour. They then further devide the sand inside the jar into 60 smaller cups, which mean a minute. They dont do the same with seconds using sands though, as it is not accurate enough. They measure the amount of water fall in the same time a cup of sand fall. Then they made smaller hourglass which use water and divide the cup of water into 60. The later civilisation dont bother making new measurement system of time, so they just copy the sumerian.

Answer 7

Theres 365 days 5 hours 48 minutes and 46
seconds it takes the earth to do one revolution around the sun.
Every 4 years a day is added to the calendar to adjust for the 5hrs 48minutes46sec.
but every 128 years an adjustment is made by adding 1 day because of the 11 min.14sec offset which is about 1 day over a hundred years.
This correction was made in 1582 by pope
Gregory.
The calendar is off only by a day, but for practical purposes its good enough.
Nobody knows who made the first clock.
3500 b.c. sundials have been found in Egypt
a simple stick in the ground for measuring time, then the hour glass, and the water clock all attribute to the ultimate clock we use now.
Cavemen can simply look at a full moon and position of the star constellation giving the position of the earth in relation to the sun to know when the season were to change for purposes of farming and storing food.
Astronomy I'm sure was the first real calendar and that theory was refined into a
more accurate measure of time as demands of technology grew greater and greater.

Answer 8

This is just a kind of measurement. Just like how you measure your height in units of foot, meter, centimeter.
Time measurement is base on the sun, and to be exact, the time taken for the earth to revolve around the sun and the time taken by the earth to rotate around it's axis that gives us day and night.
hour , minutes, and seconds are purely a form of measuring this natural occurence of our planet.
This would be entirely different if you were on Mars.
Well, we do need something to measure against, right?
So that's why man uses the natural elements like the time taken for the planet to rotate around it axis in one cycle as a measurement unit. Right?
And, also the natural ticking elements of a quarz crystal or anything that is precise and it is able to measure time is used.
The year 2007 is also a type of measurement base on the roman calender, and base on the birth of christ.
The leap year just a result of a defect in the calender system we used, and hence, we need to correct it every 4 years. In the past, the romans did not know it. But, then, one smart guy realised that, the crop seasons seems to be wrong, and he made some calculations and corrected the calender by introducing leap year. :) haha...
A mistake by man! :)
Well, the calender is used in agricultural, predicting the seasons and many more.
A long long time ago, man were primitive animals, and do not know how to measure time. So, it all started when civilization grew and advancement in science and astronomy gotten better.
What actual time you ask? Well, scientist might say that time in earth starts at the very begining of this planet itself after the big bang, millions of years ago.

Answer 9

Don't know who decided about 60 seconds, 60 minutes etc. Is it something to do with the degrees on a sundial? not sure

But the 2007 comes from religion. It's supposedly 2007 years after Jesus Christ's birth. Other religions have other years as the current date.

So does anyone know what year it was in the year of Jesus' supposed birth? Obviously, now we call it 0 or 1 A.D. (i don't know which). But what would they have called it before they reset the calendar for Jesus?

Answer 10

Hours and minutes and seconds are man-made distinctions. We create units of measurement so we can help comprehend the world around us. We could very easily change the definition (some societies divide the day into 12 units instead of 24). Just think of the Imperial system of measures versus the Metric.

Cave men didn't care what time it was... there was day and night. He knew to be safe in his cave at night, and to hunt and gather during the day.

Answer 11

We invented and defined it that way.

We could have said there are 50 seconds in a minute with each second being slightly longer than it is now.

A day is the exact rotation of the earth. Someone then deicded to split it up into 24 chunks and called it an hour. They then split that up into 60 chunks called minutes and again and called seconds.

There are 365.25 days in a year. That is why every 4 years, we need to a leap year to keep it balanced out.