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The division of day and night began with the Babylonians and Egyptians, who divided the day and night into 12 equal parts, probably to coincide with the movements of constellations (or the observed number of lunar cycles per year). Because day and night are only equally long at the equator, this would create hours of unequal length. So the 24 hour system, with varying times for sunrise and sunset, was eventually adopted.
The Greeks divided the year into 12 months, to coincide with the 12 observed lunar cycles in a calendar year.
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∙ 14y ago
Wiki User
∙ 15y ago24 is an arbitrary number chosen primarily because it has many factors. The number of factors permits the day to be divided into equal measures of two, three, four, six, twelve, and 24, respectively.
Whoever chose 24 might have as easily selected 36 hours, which also has lots of factors, and is 1/10th of a circle. There was probably some numerological significance to 24.
My guess is that 24 is closer to 27, which is about the number of days in a lunar month.
Wiki User
∙ 12y agoThis is due to the fact that the earth rotates and it takes nearly 24 hours for the earth to compete 1 rotation.
It actually takes exactly 24 hours on average for the Earth to make one rotation with respect to the sun by definition (it's off very slightly for most individual days, because the Earth doesn't move at constant speed in its orbit).
Wiki User
∙ 14y agoThe "24 hours" existed before the "day" did, as this (about 24 hours) is the time it takes for the earth to make one complete revolution on its axis. We came to call this period of time a day.
Wiki User
∙ 12y agoThe time it takes for the earth to rotate once was broken into 24 parts.
This was done before people understood or knew about fractions. 24 was chosen because it was a convenient number with several factors. This was also the case when choosing minutes and seconds as subdivisions of an hour.
Wiki User
∙ 15y agoThe day is actually made of 23hours and 56minutes. It is that way because the earth takes hat amount of time to spin around itself once.
Wiki User
∙ 13y agoBecause that is how we defined a day, as 24 hours.
Wiki User
∙ 12y agothere are 24 hours in a day because there is. live with it bum
well really there is because it takes 24 hrs. to spin in a complete circle and i think im smarter than you. HAHA and HA!
Wiki User
∙ 11y agoAn Earth Day is 24, based on revolution of Earth and year based on orbit around Sun, but is not precise to the second which is why we have leap years every few years.
Wiki User
∙ 15y agoYes
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How many earth days is 355 martian days?
Here is how to find the answer in mathematical steps: We first have to find out how many earth hours 355 Martian days is. Since a Martian day (called a sol) is 24.6 hrs long, we have to multiply 355 sols by 24.6 hrs to get the result of the number of earth hrs in 355 sols. 355 X 24.6 = 8,733.0 earth hours in a sol Next, we have to divide 8,733 hrs by 24 hrs to get the result of how many earth days 8,733 hrs is equivalent to. 8,733 / 24 = 363.875 earth days Finally, we should convert the .875 of 365.875 earth days to hrs. To do this, we have to multiply 24 by .875 24 X .875 = 21 hrs So in conclusion, we find that 355 sols is equivalent to 363 earth days and 21 hrs.
How many Mars days in one earth year?
356. There are about 0.975 Martian days in one Earth day, and 365.25 Earth days in one Earth year, and 0.975 * 365.25 ≈ 356.009.
What is the difference between rotation period and orbital period?
period of rotation = day (24 hrs. only for Earth) orbital period = year (not 365.25 days only for Earth)
Does the earth rotate 24 times a year?
NO!
What is the distance of all planets from the sun and how many days does it take it for them to rotate around their own axis and to revolve around the sun?
Name of Distance from Time takenplanet Sun(approx.) to rotate andrevolve respectively(approx.)Mercury 58 million km 58 earth days; 88 earth days Venus 108 million km 243 earth days; 224 earth daysEarth 149 million km 24 hrs; 365 earth daysMars 228 million km 24.6 hrs; 687 earth daysJupiter 778 million km 9.84 hrs; 12 earth yrsSaturn 1427 million km 10.2 hrs; 29 earth yrsUranus 2870 million km 17.9 hrs; 84 earth yrsNeptune 4496 million km 19.1 hrs; 164 earth yrs
How long does it take earth to rotate and orbit once?
about 24 hrs and 1 year
24 hrs is equal to how many minutes?
24 hours is 1440 minutes
How long does it take for the Earth to make?
24 HRS
Why February have 28 days?
February has 28 days because when the earth orbit the sun it take 1 year + 6 hrs so, the scientist decided to add these 6 hrs+ 6 hrs+ 6 hrs+ 6 hrs= 24 hrs = 1 day
How far do you travel for a one hour time change?
We travel about 1670.45 kms per hour relative to the space. Earth takes full circle in 24 hrs. So total distance covered in 24 hrs by any body present on the surface of the earth is equal to the circumference of the earth, which is 2*pi*r where "r" the radius of earth is 6378.1 kms.
What happens every 24 hrs on earth?
One Earth Day passes.
How many earth days is 355 martian days?
Here is how to find the answer in mathematical steps: We first have to find out how many earth hours 355 Martian days is. Since a Martian day (called a sol) is 24.6 hrs long, we have to multiply 355 sols by 24.6 hrs to get the result of the number of earth hrs in 355 sols. 355 X 24.6 = 8,733.0 earth hours in a sol Next, we have to divide 8,733 hrs by 24 hrs to get the result of how many earth days 8,733 hrs is equivalent to. 8,733 / 24 = 363.875 earth days Finally, we should convert the .875 of 365.875 earth days to hrs. To do this, we have to multiply 24 by .875 24 X .875 = 21 hrs So in conclusion, we find that 355 sols is equivalent to 363 earth days and 21 hrs.
How long is a week on mars?
It would be more scientific to say "How long is seven sols (Martian days)?" instead of "How long is one week on Mars?" Anyway, let's do this calculation in simple mathematical steps: We first have to find out how many hours 7 sols is equivalent to. We know that a sol is 24.6 hrs (24 hrs and 39 mins) long, so we have to multiply 24.6 by 7 to see how many hrs 7 sols is equal to. 24.6 X 7 = 172.2 hrs So we have found out that 7 sols (one Martian week) is equal to 172.2 hrs. Now, we have to convert 172.2 hrs to earth days by dividing 172.2 hrs by 24 hrs (the length of an Earth day). 172.2 / 24 = 7.175 Earth days Finally, we have to convert the .175 days to hrs and mins. We do this by multiplying .175 by 24 to convert into hrs and then multiplying the decimal part of the result by 60 to also get the mins. .175 X 24 = 4.2 hrs .2 X 60 = 12 mins So in conclusion, we have found that one Martian week (7 Martian days) is equivalent to 7 Earth days, 4 hrs, and 12 mins, which is 4 hrs and 12 mins longer than an Earth week (seven Earth days).
How many Mars days in one earth year?
356. There are about 0.975 Martian days in one Earth day, and 365.25 Earth days in one Earth year, and 0.975 * 365.25 ≈ 356.009.
What is the difference between rotation period and orbital period?
period of rotation = day (24 hrs. only for Earth) orbital period = year (not 365.25 days only for Earth)
What do you understand by Rotation of earth?
I understand that it takes one full day or 24 hrs. for the earth to complete rotation, and each 12 hrs. the earth has completed half a turn.
How do you calculate 24 hour urine protein?
test divide on Standard multiply to 100 then multiply to volume of 24 hrs urine per deciliter it equal to ( protein ? mg/ 24 hrs urine)
