How is the local time of a place fixed?
Explain briefly.
Answers
Local time is fixed by convention, normally established by the government of the territory concerned. In general it is close to mean solar time, though in some places, such as Western China, it can deviate by several hours. Here’s a map of the deviation .
One of the important things about time zones is that the local time is constant within the zone, while mean solar time differs with longitude. See Time zone - Wikipedia for the reasoning.
Answer:
two meridians are 30° separated, their time varies by 2 hours. The easternmost meridian has a later local time, on the grounds that the sun has crossed its lower branch first; in this way, the day is more established there. These announcements remain constant whether alluding to the obvious sun or the mean sun. Figure 1-14 exhibits that the sun crossed the lower part of the meridian of onlooker 1 at 60° east longitude 4 hours before it crossed the lower part of the Greenwich meridian (60 ÷ 15) and 6 hours before it crossed the lower part of the meridian of spectator 2 at 30° west longitude (90 ÷ 15). Subsequently, the local time at 60° east longitude is later by the individual sums.
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