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Lesson Local Time and Standard Time
6.2

FACTS The local time of Nepal is calculated on the basis
to Understand of Mt. Gaurishankar with its longitude of 86°15’E is
adopted all over Nepal as the Standard Time.

A time in a particular place expressed with reference to the longitude passing through,
it is called Local Time. The local time is the time of a particular place when the sun is
overhead or passing from longitude. The actual time differs from place to place as the
places have different longitudes. The difference might be by seconds, minutes, hours,
or even a day depending
upon the longitudes covers
the land areas. Nepal is
stretched east to west that
is 80° E to 88° E longitudes
approximately. The sun
does not rise at the same
time in Bhadrapur and
Mahendranagar. As a result
the time in Bhadrapur
at 88°E longitude will be
ahead by 32 minutes than
the time of Mahendranagar
located at 80°E longitude. Gauri Shankar Himal

A local time is an accurate time for its place. But it is very inconvenient and impractical
and also impossible to follow the local time. It can create lots of complications and
difficulties in doing many day to day activities if follows the local time. So, in order to
avoid such difficulties, a local time of a place has been fixed and adopted as a standard
time all over the country or a particular region by the government. Standard time is
an average time that can be applied throughout the country. 84°E would be the exact
average longitude for Nepal. As a practice we have taken 86°15'E longitude passing
through Mt. Gauri Shankar, Dolakha as such Meridian. The same is the standard
meridian for Nepal We have to see the relation between this longitude and the Prime
Meridian. When we measure Nepal’s Standard Time from the Prime Meridian, it is
5 hours and 45 minutes (86°12' x 4 min = 345 minutes is equals to 5:45 min) a head
of the GMT. This is the standard time for Nepal. If a country covers two or more
time zones there are more standard times applied within the country. For example,
Canada has adopted 4 standard time. The USA has adopted 5 standard time and
Russia has adopted more than 11 standard times. The local time of London is called
the Greenwich Mean Time (GMT).

Some notable things while calculating difference of time and longitude
1° = 4 minutes
15° = 60 minutes (1 hour)
191 Dynamic Social Studies - Book IX