Midnight.
The prime meridian is located at 0 degrees longitude and passes through Greenwich, England. The international dateline is located at 180 degrees longitude and is opposite the prime meridian, roughly along the 180th meridian in the Pacific Ocean.
No. That would be the International Date Line.The Prime Meridian is defined as zero longitude.
This is called the Prime meridian, it passes through Greenwich, England.
I have a feeling that the meaning of "it" in this question is of paramount significance, and that if we but knew it, an answer would be possible.
That would be the Prime Meridian.
Ideally, the International Date Line should be the meridian of 180° longitude. Actually, it has been zigged and zagged to avoid cutting across any island or country, since to do so would put two different calendar dates in the same country simultaneously. If the IDL coincided with the 180° meridian, then together with the Prime Meridian, it would form a great circle on the earth, passing through the north and south poles as well as through Greenwich. As it is now, the Prime Meridian, the 180° meridian, and all other meridians of longitude are semi-circles, that begin and end at the poles.
The prime Meridian is 0 degrees longitude.
It is sometimes called the Greenwich meridian or 0° longitude.
Assuming that "all the way west of the Prime Meridian" would be on the opposite side of the globe from the prime meridian, or at 180o, "halfway west of the Prime Meridian" would be the 90oW meridian.
The 180th meridian or antimeridian is the meridian which is 180° east or west of the Prime Meridian ... It is common to both east longitude and west longitude. It runs through the Pacific Ocean, and was the nominal guideline for the position of the International Dateline, although the dateline itself had to depart from the antimeridian in several places.
The Prime Meridian is defined as Zero Longitude. Any longitude that you feel is "close" to zero is close to the Prime Meridian.
Eastern side of USA is nearer the Greenwich meridian in London UK.