Question

Calculate the location of a place where the local time is noon when it is 7:30 p.m. at Greenwich

Answer 1

If it is 7:30 p.m. in Greenwich, then noon will be at 4:30 p.m. on its west side, which is at 67.5 degrees west.

Calculation of the location:

• Greenwich time is 7:30 p.m.

• The 0° longitude is Greenwich and 12 p.m. at the given location.

• The time difference between the two locations is 7 hours 30 minutes.

• Because the time at a specific location is less than the Greenwich meridian, the location is west of it. The earth takes 4 minutes to cover 1°.

• As a result, covering 15° will take 60 minutes (1 hour).

• In 7.5 hours, the Earth will have covered 112.5° (15x7.5). As a result, the location is 112.5° West.