Yes, it is.
The 180th meridian or antimeridian is the meridian which is 180° east or west of the Prime Meridian with which it forms a great circle.
The Prime Meridian is complete as it appears on maps or globes. It forms a half-circle, and isn't missing anything. When joined with the Prime Meridian, the 180-degree meridian of longitude forms a complete great circle.
The Prime Meridian is complete in and of itself, with nothing missing.It's only a semi-circle, however, which may, understandably, leave some with anuncomfortable feeling of virtual incompletitude.Those who feel that there's something inherently unsatisfying about a semi-circlemay join the Prime Meridian with the meridian of longitude at 180°, and therebyarrive at a partnership that forms a true, complete, great circle on the Earth.
Every line of longitude forms a great circle.
The latitude and longitude references are lines, not points. The reference for latitude is the line that forms a circle and consists of all points with zero latitude. That line is called the "equator". The reference for longitude is the line that forms a semi-circle and consists of all points with zero longitude. That line is called the "Prime Meridian".
The 180th meridian or antimeridian is the meridian which is 180° east or west of the Prime Meridian with which it forms a great circle.
The Prime Meridian is complete as it appears on maps or globes. It forms a half-circle, and isn't missing anything. When joined with the Prime Meridian, the 180-degree meridian of longitude forms a complete great circle.
180th Meridian
The Prime Meridian is complete exactly as it appears on maps and globes. It forms a half-circle, and it isn't missing anything. When joined with the Prime Meridian, the 180-degree meridian of longitude forms a complete great circle.
The 180th meridian or antimeridian is the meridian which is 180° east or west of the Prime Meridian with which it forms a great circle.
The Prime Meridian is complete in and of itself, with nothing missing.It's only a semi-circle, however, which may, understandably, leave some with anuncomfortable feeling of virtual incompletitude.Those who feel that there's something inherently unsatisfying about a semi-circlemay join the Prime Meridian with the meridian of longitude at 180°, and therebyarrive at a partnership that forms a true, complete, great circle on the Earth.
The Prime Meridian is complete just the way it's drawn on maps or globes. It's not missing anything. When the Prime Meridian is joined with the 180° meridian of longitude, the combination forms a single, complete great-circle.
Every line of longitude forms a great circle.
The opposite of the Prime Meridian -- 180° East (or West) Longitude -- is traditionally referred to as the International Date Line, though substantial portions of the line deviate from the true meridian in order to accommodate geopolitical boundaries (countries).
The International Date Line (IDL) is roughly along 180° longitude, with diversions to pass around some territories and island groups.
The International Date Line roughly follows the 180th meridian.
The latitude and longitude references are lines, not points. The reference for latitude is the line that forms a circle and consists of all points with zero latitude. That line is called the "equator". The reference for longitude is the line that forms a semi-circle and consists of all points with zero longitude. That line is called the "Prime Meridian".