in sh world 1 min = 2km 1 degree = 120km or 60 min
maybe
this one will help u
Edit:
Quote:
Calculating longitude by comparing time difference. If we have two accurate clocks, one calibrated to GMT and the other calibrated to local time, then it is an easy matter to calculate our longitude from the difference between the two times.
For example, if the difference between GMT and local time is three hours, then the difference in longitude must be 3 x 15o. If local time is ahead of GMT then the local longitude must be East of the Greenwich Meridian and if local time is behind GMT the longitude must be West.
Example: If it is 18.00 GMT when it is 09.20 local time on the same day, then local time must be 8 hours and 40 minutes behind GMT. Therefore Long = – [(8 x 15o) + (40 ÷ 60 x 15o )] = – [120o + 10o] = -130o = 130o West
|
more about astronavigation
here