We use imaginary lines to help locate where a place is in the world. the Arctic Circle (the North Pole) the Antarctic Circle (the South Pole) the Tropic of Cancer the Tropic of Capricorn and the ...
1. Find a radio station that broadcasts the 'GMT (Greenwich Mean Time) pips' on the hour, giving the time at the Prime Meridian. 2. Construct a device to work out local noon, like a north-south line.
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