Whats the Time secondsWhat is the time seconds
Basic units definitions: sec
Its second time period was initially set as a 1/86 400 fractions of the mean sundays. Precise definitions of the "mean sun day" were given to mathematical philosophies. Measurements, however, showed that unevenness in the Earth's rotational system could not be taken into consideration by the theoretical system and that this did not achieve the necessary precision.
With a view to defining the time units more accurately, the eleventh General Assembly of Astronomers (CGPM) (1960) adopted a International Astronomical Union concept using the tropic year as a basis. However, experiments had already shown that an Atomic Time Intervention Spectrum, which is predicated on a junction between two different energies of an atoms or a molecules, can be much more accurately realised and replicated.
Recognising that a very accurate delimitation of the temporal units is essential for the International System, the thirteenth General Assembly of the Parties (CGPM) (1967) resolved to substitute the delimitation of the second by the following (confirmed in 1997 by the CIPM that this delimitation referred to a caesium element in its basal state at a zero kilogram temperature):
Second is the length of 9 192 631 770 cycles of irradiation corresponding to the passage between the two hyper-fine stages of the Ground State of the caesium 133 element.
Videotape: adding or subtracting time
Best way to do this is to use the AutoSum pushbutton on the HOME page. With the TIME feature, you can also assign a time element, for example, 1 ½ With the TIME feature, you can also assign a time element, for example, 1 hour, to a time of the day, for example, 10:00 a.m. Let's say you want to know how many lessons and how many minute it takes to get two jobs done.
It is estimated that the first assignment takes 6h45 and the second 9h30. Inside cells B 2, 6:45 and B 3, 9:30. Enter =B2+B3 in BG4, and then hit Enter. This will take 16 hour and 15 minute to do.
When you click inside cells C4. To get the results, hit return, 16 hour and 15 minute. Time can be added in Excel just as you would any other number. That' s what I want, so I click on it again and get the whole time for the work. In order to launch a calculation, always use a = character, click on D2 cells, input the + character, click on D3 cells and hit return.
Twelve and a half hour and 45 plus 15 and a half hour, that's not four and a half hour and 15 minute. Because I know that the equation is accurate, it must be how the D4 cells are set to time. This example shows that the sum is greater than 24hrs. There are many ways Excel can show the time, such as hour and minute, or hour, minute and second; a.m., p.m., or a 24-hour watch; or a number greater than 24 hour, as required in this example.
Right-click the right mouse button to reformat the cells, and then click Reformat Cells. Enter the right angle parenthesis, right angle parenthesis, double point, and then mm in the box Typ. Corner parentheses tell Excel to go over 24hrs. It is for hour and mm for minute. For more information on how to set the time, see the course outline at the end of this course.
Now we just click OK and the overall time will be shown properly. It is possible to use the squared parentheses even if the time does not pass more than 24h. When you are not sure whether a number of more than 24 hrs will be reached, it is best to use it. It is also possible to assign a time element, for example, one and a half hour, to a time of night, for example, 10:00 a.m., by using the TIME command.
Fill in = character, then click onto U7 (which contains the time of night, 10:00 a.m.), then fill in + character, TIME, 1 (for the number of lessons we want to add), 1 (for the number of lessons we want to add), 30 (for the lessons we want to add), 0 (for the seconds), a close bracket, and hit return.