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Are 1 minute and 60 seconds the same?
Yes, usually. Most minutes have 60 seconds; although now and then a leap second is added.
How many seconds are in 18 yrs?
Allowing for leap years, there are 6573, 6574 or 6575 days in 18 years. That is equivalent to 567907200, 567993600 or 568080000 seconds respectively. Furthermore, there may be some leap seconds - usually added but occasionally subtracted.
How many seconds since January 21 1953?
The number of seconds since 21 January has changed since I started calculating, Drat, I will just have to ... Oh no, its changed again. Also, I need to get information on all the leap-seconds that have been added.
What fraction of an hour is 39 seconds?
It is 39/3600, which can be simplified but you may prefer to wait until you are sure there no other fractions of an hour to be added or subtracted.
How many seconds are in 53 years?
1 666 828 800 is the number of seconds in 53 years. * * * * * I disagree. 53 years can contain 12 to 14 leap years: 12 if it start on an ordinary year and includes a century year which is not a multiple of 400, 14 if it starts and finishes with a leap year and 13 otherwise. That is 19,357 or 19,358 or 19,359 days. Each day is 24 hours: so the above gives 503,282 or 503,308 or 503,334 hours. Each hour = 3600 seconds so the answers are: 1,672,444,800 seconds or 1,672,531,200 seconds or 1,672,617,600 seconds, Then, just to complicate matters, the earth's year is not a constant and from time to time leap seconds are added (and less often) subtracted. There is no systematic patter to leap seconds. In any case, the previous answer would imply 19,292 days which is way short of the 19,345 days required by 53 ordinary years.
