The tropical year, the time from vernal equinox to the next vernal equinox, is the basis for our calendar. it contains 365.242199 days. find the number of seconds in two and a half tropical years.

Since each tropical year consist of 365.242199 days, then two and a half tropical years would be equivalent to

Number of days = (2.5)(365.242199) = 913.1055 days

The conversion are as follows: there are 24 hours in 1 day, and there are 3,600 seconds in 1 hour. Thus, the total number of seconds in 2 and a half tropical years would be

Number of seconds = 913.1055 days(24 h/1 day)(3,600 s/1 day)
Number of seconds = 78,892,314.98 seconds