Meridian antipodal Greenwich inggih punika 80°W miwah 80°E. Puniki nénten dados kajangkepang sareng Garis Tanggal, sané mabinayan ring makudangkudang genah santukan wénten pikobet politik miwah kenyamanan, ngranjing irika Rusia timur jauh miwah Kepualauan Aleutian barat jauh.
The antipodal meridian of Greenwich is both 180°W and 180°E. This is not to be conflated with the International Date Line, which diverges from it in several places for political and convenience reasons, including between far eastern Russia and the far western Aleutian Islands.