180 degrees
180°
180 degrees
180 of them.
Midnight, on the morning of the day after.
No. That would be the International Date Line.The Prime Meridian is defined as zero longitude.
The Greenwhich meridian also Prime Meridian is 0 degrees longitude and International Date Line roughly follows the 180° longitude or antimeridian. The antimeridian is the meridian which is 180° east or west of the Prime Meridian.
Prime meridian, International Date Line, time zones
The IDL roughly follows the meridian of 180° longitude.
The Prime Meridian. Opposite Prime Meridian (180-degrees Longitude) is The International Date Lin.
-- The "Prime Meridian" marks zero longitude. -- The "180th meridian" marks 180° longitude. The International Dateline is either on or relatively near the 180th meridian at any given latitude on it.
Each line of longitude extends from one pole to the other, perpendicular to the equator. Along each meridian, the equator is 0° latitude, the north pole is 90° north latitude, and the south pole is 90° south latitude. The prime meridian, which is the meridian that passes through Greenwich, England, is 0° longitude, and the international date line, directly opposite the prime meridian, is 180° east or west longitude.
By international agreement, the Prime Meridian is defined as zero longitude, and it's the one from which all other longitudes are measured.