How many meridians are west of the prime meridian?

Answer:
180° of longitude are marked off east of the Prime Meridian, and another 180° west of it.

You're free to draw in as many reference lines on your map as you'd like. There's no
set number of lines, that you have to pick one from when you measure the longitude
of a place.
First answer by ID0403500258. Last edit by Alcohen2006. Contributor trust: 1141 [recommend contributor recommended]. Question popularity: 2 [recommend question].