For example: 15 =15'; 15 second = 15 "
Minute means', and second means ". Minutes are one and seconds are two. The abbreviation of minutes is min, and the abbreviation of seconds is S.
In practical application, the angle of an integer is accurate enough. Sometimes more accurate measurements are needed, such as astronomy or the latitude and longitude of the earth. In addition to expressing degrees in decimals, degrees can also be subdivided into minutes and seconds: 1 degree is 60 minutes (60') and 1 degree is 60 seconds (60 "). For example, 40.1875 = 4011'15 ". To be more accurate, seconds are expressed in decimals instead of adding units.
The symbols of hours, minutes and seconds are: hours are hr, abbreviated as H minutes, min, abbreviated as M seconds and sec, abbreviated as S hours, and minutes and seconds are time units. The basic unit of the international system of time units is the second. Except leap second, one hour is generally equal to 3600 seconds, or 60 minutes, or 1/24 days. The time of human daily life is generally measured in hours. For example, the time in a day, for example, 8 am, is the eighth hour in a day. The conversion relationship of hours, minutes and sec(s is: 1 hour hr (h) = 60min min (m) = 3600sec (s).