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Zero Longitude
This commemorative stamp features a line that divides the globe into two hemispheres. The photograph of the Earth was taken by astronauts on the Apollo 11 mission to the moon.

Looking for a Clue?
On March 13th, time clues will be revealed to help you estimate how far east or west each mystery site is from zero longitude.

Stamp

© Stamp Design Royal Mail Group Ltd (1984)