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Example Two
| Step # 1 Mystery Class #6's sunrise time is given as 20:20 (GMT) on March 19. This means it was evening in Greenwich when the sun rose at this site. |
BOX A 20:20 P.M. (3/19) |
| Step # 2 Sunrise time at Greenwich was 6:02 A.M. |
BOX B 6:02 A.M. (3/20) |
| Step # 3 The number of hours and minutes between A and B is 9 hours and 42 minutes |
BOX C 9 hrs 42 min |
| Step # 4 Convert the amount of time in Box C into minutes by multiplying the hours by 60 and adding the remaining minutes (9 x 60=540 + 42 = 582 minutes) |
BOX D 582 minutes |
| Step # 5 Figure out the degrees away from Greenwich by dividing the minutes in Box D by 4 (582 divided by 4 = 145.50 degrees ) |
BOX E 145.50 |
| Step # 6 Eastern or Western Hemisphere? To determine the site's 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, 22:20 on 3/19 was earlier than 6:02 A.M. on 3/20. This means the site is east of Greenwich, in the Eastern Hemisphere. |
BOX F 145.50 E |
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