The meridian 120° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.
The mean solar time at this meridian determines the time for the Pacific Time Zone (UTC−08:00) during standard time. Most of the year however, it is the meridian for Alaska Daylight Time, as daylight saving time is observed for nearly 2/3 of the year.
|Co-ordinates||Country, territory or sea||Notes|
|Canada||Northwest Territories — Prince Patrick Island|
|Canada||Northwest Territories — Banks Island|
|Prince of Wales Strait|
Northwest Territories — passing through Great Bear Lake
British Columbia / Alberta border — from
British Columbia — from Intersection Mountain at ; at this point the meridian meets the Continental Divide, and the boundary with Alberta diverts southeast
Oregon — from
California / Nevada border (approximate) — from
California — from
|Pacific Ocean||Santa Barbara Channel|
|United States||California — Santa Rosa Island|
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