latitude and longitude
The normal abbreviation for East Coast time is EST (Eastern Standard Time).
The Greenwich Meridian, also known as the prime meridian or International Meridian, is the "starting point" for dividing the Earth's surface into time zones. Each time zone is 15 degrees of longitude wide (with local variations) and the local time is one hour earlier than the zone immediately to the east on the map
That would be 5.5 times 15°, putting it at 82.5° east longitude.
The Pacific Standard Time Zone should be centered around 120° west longitude.
It is definitley not a scientific concept, let alone a time zone like the Prime Meridian or the International Date Line.
The Greenwich Meridian, also known as the prime meridian or International Meridian, is the "starting point" for dividing the Earth's surface into time zones. Each time zone is 15 degrees of longitude wide (with local variations) and the local time is one hour earlier than the zone immediately to the east on the map.
The central meridian for Eastern Standard Time (EST) is 75 degrees west longitude. This meridian serves as the reference point for the time zone, which is 5 hours behind Coordinated Universal Time (UTC-5).
The full meaning of a.m. in 10 a.m. is "ante meridian," which translates to "before the meridian." It is the part of the day when the sun has not yet reached the meridian in a particular time zone.
The prime meridian goes east to south, as the equator runs east to west. The prime meridian is used as 12:00AM on a time zone map
If you are to the west of the Greenwich Meridian (as is the US, for example) You subtract an hour for each time zone. Eastern Standard Time in the US is 5 hours behind GMT. Be sure to adjust for daylight saving time. GMT is always standard time. If you are to the east of the Greenwich Meridian, you add an hour for each time zone.
That would be zero degrees longitude.
The time meridian is each standard time zone roughly centered on a line of longitude exactly divisible by 15 degrees and the prime meridian is the starting point for the standard time zones an arbitrary longitude line.