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Note added at 39 days (2012-03-22 15:12:13 GMT)
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Уважаемый аскер,уделите, пожалуйста, пару минут на закрытие вопроса.Спасибо.

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Note added at 42 days (2012-03-24 19:09:30 GMT)
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Змейка,если речь о временнЫх дублях, то мой предыдущий ответ не подходит совершенно."Временные дубли" это "Time zone feeds/separate feeds".
Вот определение на русском:
Большинство национальных каналов вещают с использованием орбит(иначе называемых дублями)- версий канала ,предназначенных для различных часовых поясов. Число орбит варьируется от двух до пяти.
http://www.acvi.ru/Portals/0/docs/8678_0.pdf

на английском:

Time zone feeds
With four time zones in the contiguous United States, U.S. national networks and cable channels generally air at least two separate feeds to its stations and affiliates: the "east feed" that is aired simultaneously in the Eastern and Central Time Zones, and the "west feed" that is tape-delayed three hours for those in the Pacific Time Zone. This ensures that a program, for example, that airs at 8 p.m. on the east coast is also shown locally at 8 p.m. on the west coast. Networks may also air a third feed specifically for the Mountain Time Zone, which usually airs on a one-hour delay from the east feed; otherwise those in the Mountain Time Zone get the west feed.

The Eastern Time Zone is commonly used as a de facto official time for the United States, since it includes the nation's capital Washington, D.C., the country's largest city, New York, and nearly half of the country's population.[2] Because of this, television schedules are almost always posted in Eastern Time. Broadcast networks and cable channels also advertise airtimes in Eastern time, sometimes also including either Central or Pacific time and until the 1980s, Mountain time, depending on whether there is a separate feed for that time zone. This has led to conventions like "tonight at 9/8 Central" (referring to the east feed), "tonight at 9 p.m. Eastern and Pacific" (referring to both the east feed and the three-hour delayed west feed), and "tonight at 9/8 Central and Mountain" (also including the Mountain feed).

A few cable channels may not audibly refer to the Central time airtime of a program, though their promos may also visually include references to its broadcast in both the Eastern and Central time zones. So when a viewer only hears "tonight at 8," regardless of whether the promo visually includes it or not, chances are that the show they are referring to is scheduled to air at 7 p.m. in the Central time zone.

Canada( самый конец статьи)
The French counterpart of CBC, Radio-Canada, has four feeds to allow programs to air at the same time, local time in each time zone, except for the Atlantic and Newfoundland time zones, which air programs at the same time as in the Eastern Time zone, but 60 and 90 minutes later respectively on their clocks (eg. 20h00 HE/21h00 HA/21h30 HT).
http://en.wikipedia.org/wiki/Effects_of_time_on_North_Americ...

p.s. все эти"doubles" and "orbits" совершенно не годятся,так как встречаются только в русскоязычных сайтах на английском.имхо