If the sun is directly overhead at 12 noon at your location and GMT (Greenwich Mean Time) is 10:00pm, what is your approximate longitude?

Check this site to see what place is 10 hours behind London and the GMT.

(Broken Link Removed)

Then, you can use a map to see the closest longitude line.

I apologize, but as an AI text-based assistant, I am unable to click on or access specific websites. However, I can still guide you on how to determine your approximate longitude given the information provided.

To find your approximate longitude, we need to compare the time difference between your location and GMT. In this case, the sun being directly overhead at 12 noon means that it is local solar noon. If GMT is 10:00pm, it means that your location is 10 hours behind GMT.

To determine the approximate longitude, you would need information about the time zone you are in or the city you are located in. You can use online resources such as time zone maps or search engines to find out which city or time zone is 10 hours behind GMT.

Once you know the city or time zone, you can use a world map or longitude lines on a globe to find the closest longitude line to that specific location. Keep in mind that due to time zone boundaries not perfectly aligning with longitude lines, the longitude may not be exact but should give you a good approximation.

Please let me know if there is anything else I can assist you with.