(5) Parallel Lines drawn from east to west encircling the Earth.
(1) Abbreviated form of International Date Line.
(2) The largest possible circle on Earth.
(3) The imaginary line that is equidistant from the two poles.
(4) Short form of Greenwich Mean Time.
Across: (5) Latitude
Down: (1) IDL (2) Equator (3) Tropic (4) GMT