90 degrees west
Halfway between the Prime Meridian and 80 degrees west has to be pretty close to 40 degrees west, we'd say.
90 degrees west longitude
latitude
90 degrees
90 degrees west
90° west longitude
90 degrees west
The line 90 degrees west longitude, which includes the cities of New Orleans LA and Memphis TN.
Nominally 180° of longitude, or halfway around the Earth.
The longitude of such a place is 90° West. On any randomly chosen map or globe, there may or may not be a line printed to show that longitude.
90 degrees west
The longitude of every point on Earth, from the Prime Meridian out to halfway around the world in the westerly direction is labeled "west longitude". The longitude of every point on Earth from the Prime Meridian out to halfway around the world in the easterly direction is labeled "east longitude".