Mystery Class Mystery Class
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Example # 1

Step # 1
Mystery Class #6's sunrise time is given as 22:24 (GMT) on March 19. This means it was evening in Greenwich when the sun rose at this site.
BOX A

22:24 PM (3/19)
Step # 2
Sunrise time at Greenwich was 6:04 A.M.
BOX B

6:04 A.M. (3/20)
Step # 3
The number of hours and minutes between A and B is 7 hours and 40 minutes
BOX C

7 hrs 40 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 + 40 = 460 minutes)
BOX D

460 minutes
Step # 5
Figure out the degrees away from Greenwich by dividing the minutes in Box D by 4 (460 divided by 4 = 115.00 degrees )
BOX E

115.00
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, 22:24 on 3/19 was earlier than 6:04 A.M. on 3/20. This means the site is east of Greenwich, in the Eastern Hemisphere.
BOX F

115.00 E

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