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Example # 2
| Step # 1 Mystery Class #8's sunrise time is given as 9:10 (GMT) on March 20. This means it was morning in Greenwich when the sun rose at this site. |
BOX A 9:10 (3/20) |
| 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 3 hours and 6 minutes |
BOX C 3hrs 6 min |
| Step # 4 Convert the amount of time in Box C into minutes by multiplying the hours by 60 and adding the remaining minutes (3 x 60=180 + 6= 186 minutes) |
BOX D 186 minutes |
| Step # 5 Figure out the degrees away from Greenwich by dividing the minutes in Box D by 4 (186 divided by 4 = 46.5 degrees) |
BOX E 46.5 degrees |
| 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, 9:10 on 3/20 was later than 6:04 A.M. on 3/20. This means the site is west of Greenwich, in the Western Hemisphere. |
BOX F 46.5 W |
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