Greenwichský poludník: Rozdiel medzi revíziami

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[[vi:Kinh tuyến gốc]]
[[zh:本初子午線]]
Have your photo taken standing on the Meridian Line. A meridian is a north-south line selected as the zero reference line for astronomical observations. By comparing thousands of observations taken from the same meridian it is possible to build up an accurate map of the sky.