History 1Minute = 60Seconds
Numbers 60 Is Used for the stated,an hour 60 minutes ,One minute 60 seconds. Number 60 was frist used by the Sumerians,so they count in base 60 or also called sexagesimal.
The reason why the number 60 is the number used is the smallest number that can be shared by the first six digits are: 1,2,3,4,5,6.
So we can easily imagine: 1 / 2 hour = 30 min, 1 / 3 hours = 20 minutes, 1 / 4 hour = 15 minutes, and so on. Imagine if one hour = 100 minutes, then 1 / 3 hours = 33.333 min? If they say, it's the sound of guns ...
If mathematical words, 60 is highly composite number, or number of denominator / factor a lot, namely 1,2,3,4,5,6,10,12,15,20,30,60.
SecSeconds or seconds is the time unit in the SI (International System, see SI units) is defined as the duration of 9,192,631,770 times during the period of radiation associated with the transition from the two hyperfine levels in the state of the ground state of cesium-133 atom at zero kelvin temperature.
In the most common usage, one second is 1 / 60 of one minute, and 1 / 3600 of an hour.
HistoryAt first, the second term in English is known as a "second hour" (the second minute), which means a small part of an hour. The first part is known as a "prime minute" (minute prime) with the same minute as it is known today.
The magnitude of this division fixated on 1 / 60, ie, there are 60 minutes in an hour and there are 60 seconds in a minute.
This may be caused by the influence of Babylonian people, who use a count system based on sexagesimal (base 60).
The term clock itself has been discovered by the Egyptians in the Earth's spin as 1 / 24 of the mean solar day. This makes the second as 1/86.400 of the mean solar day.
In 1956, the International Committee for Weights and Measures (CIPM), under the mandate given by the General Conference on Weights and Measures (CGPM) to ten in 1954, describes the second in a period of rotation of the earth around the sun at the time epoch, for at that moment has been realized that the Earth's rotation on its axis is not uniform enough to be used as a standard time.
Earth movement was described in Newcomb's Tables of the Sun (solar List Newcomb), which provides a formula for the motion of the sun at the epoch in 1900 based on astronomical observations made during the 18th century and 19.
Thus the second is defined as 1/31.556.925, 9747 part of the solar year in the date 0 January 1900 12 hours ephemeris time.
This definition was ratified by the General Conference on Weights and Measures to eleven in 1960. Reference to the year 1900 does not mean this is the epoch of the mean solar day contains 86,400 seconds. Rather it is the epoch of the tropical year which contains 31,556,925.9747 seconds of Ephemeris Time.
Time Ephemeris (Ephemeris Time - ET) has been defined as a measure of time which gives the position of celestial objects visible in accordance with Newton's theory of dynamic movement.
With the establishment of an atomic clock, then ditentukanlah use atomic clocks as the basis for the definition of seconds, no longer with the rotation of the earth.
From the work of several years, two astronomers in the United States Naval Observatory (USNO) and two astronomers at the National Physical Laboratory (Teddington, England) to determine the relationship of the hyperfine transition frequency of the cesium atom and the ephemeris second.
By using common-view method of measurement based on signals received from radio stations WWV, they determine that the orbital motion of the moon around the earth, from which the sun's apparent motion could be guessed, in a unit time atomic clock.
As a result, in 1967, the General Conference on Weights and Measures defined the second of atomic time in the International System of Units (SI) as
The duration of 9,192,631,770 periods of radiation with respect to the transition between two hyperfine levels of the ground state of cesium-133 atom.
Ground state in non-defined circumstances (zero) magnetic field.Seconds defined is equal to the ephemeris second. The next second definition is refined in meetings BIPM to include the sentence.
This definition refers to a cesium atom at rest at a temperature of 0 K. In practice, this means that the realization of seconds with high accuracy should compensate for the effects of radiation around it to try mengextrapolasikan the second price as mentioned above.
Everyone must know the time, so let's study the conversion or change in time following:
1 Second = equal to one 60 Minutes (1 / 60 Seconds).Equals 1 Minute = 60 Seconds.1 Hour = Equals 60 Minutes.Equals 1 Hour = 3600 Seconds.1 Day = 24 Hour Equals.1 Day = Equals 1440 Minutes.1 Day = Equals 86,400 Seconds.1 Week = 7 Days Equals.1 Month = Same With 28 To 31 Days.Equals 1 Month = 4 Weeks.A quarter Or cawu = Same With 4 Months.1 Semester = Equals 6 Months.1 Year = 365 Equals Up to 366 Days.1 Year = 12 Months Equals.1 Decade = Equals 10 Years.1 Century = Equals 100 Years.
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