England's Royal Observatory in Greenwich (the source of Greenwich Mean Time - GMT) is 0 degrees longitude and the reference point. 120 degrees East is the longitude of the east coast of Taiwan. At that longitude, 1/3 of a circumference from Greenwich, the standard time (and date) should be 8 hours ahead of Greenwich. So if it is 4am in Greenwich, it should be noon in Taiwan.
latitude is degrees north or south of the equator and Longitude is degrees east or west of Greenwich
There is no 200 degrees of longitude. There is 180 degrees west of the Greenwich Meridian and 180 degrees east of the Greenwich Meridian. All degrees of longitude on earth converge at the South and North Poles.
Longitude
The 0 degrees longitude line is known as the Greenwich Meridian. From its name, it originated in Greenwich, a district in East London.
The continent that lies at 30 degrees south latitude and 120 degrees east longitude is Australia.
Europe, Africa and Antarctica
Longitude is the measurement in angular degrees around the globe east or west of Greenwich, England.
The longitude at the center of Cairo is roughly 31.23° East.
The continent that lies at 120 degrees east longitude is Australia.
If it is 12 noon at Greenwich (0 degrees longitude), then every 15 degrees of longitude corresponds to a one-hour time difference. Therefore, if you are 30 degrees east of Greenwich, the time would be 2:00 PM.
40 degrees north latitude and 105 degrees east longitude intersect in Asia.