Example One
| Step
# 1 Mystery Class #4 sunrise time is given as 22:16 PM (GMT) on March 20. This means it is late evening in Greenwich on the preceding day, March 20, when the sun rises on March 21 at this site. |
BOX A 22:16 P.M. (3/20) |
| Step
# 2 Sunrise time at Greenwich on March 21 is 06:02 A.M. |
BOX B 06:02 A.M. (3/21) |
| Step
# 3 The number of hours and minutes between A and B is 7 hours and 46 minutes |
BOX C 7 hrs 46 min |
| Step
# 4 Convert the amount of time in Box C into minutes by multiplying the hours by 60 and adding the remaining minutes (7 x 60 = 420 + 46= 466 minutes) |
BOX D 466 minutes |
| Step
# 5 Figure out the degrees away from Greenwich by dividing the minutes in Box D by 4 (466 divided by 4 = 116.50 degrees) |
BOX E 116.50 degrees |
| Step
# 6 Eastern or Western Hemisphere? To determine the site's approximate longitude you need to know if it is in the Eastern or Western Hemisphere (i.e east or west of Greenwich, which is 0 degrees). Here, 22:16 P.M. on 3/20, the preceding day,was earlier than 06:02 A.M. on 3/21, so this longitude location is East. This means the site is east of Greenwich, in the Eastern Hemisphere. |
BOX F 116.50 E |