Longitudes Video Lecture | Social Studies (SST) Class 6

if you want to locate a place easily you
need to know the latitude and the
longitude above that place
[Music]
[Music]
longitude describes the location of a
place on the earth east or west often
not to south running imaginary line or
the Prime Meridian the lines of
longitude are lines running north-south
through the ports longitude is the
number of degrees east or west of the
Prime Meridian which passes through
Greenwich lines of longitude are
measured from the center of the earth
these lines divide the world up into
segments the Prime Meridian and the
180th region is a great circle that
divides the earth into the eastern and
the western hemisphere the 180-degree
longitude line is also referred to as
the International Dateline
[Music]
longitude is defined in terms of
meridians which are half circle's
running from pole to pole the meridians
are numbered up to 180 degree to the
east and west of the line of zero Degree
longitude or the Prime Meridian
[Music]
the value of a Meridian is followed by
the letter east of west 180 degree East
and 180-degree West meridians are the
same there are 360 meridians in total
[Music]
the birth Meridian means the highest
position of a star or the Sun which
reaches its highest position at midday a
line of longitude is called a meridian
of longitude because all places located
on it have midday at the same time
meridians are not parallel they come
together at the poles the parallels and
meridians form a mesh or a grid the
greatest foul and flat maps and globes
[Music]
as the Earth turns the Sun appears to
move across the sky this motion gives us
day and night a global time system is
also oriented to the Sun
[Music]
every day the Sun rises in the east and
sets in the west
this movement is caused by the rotation
of earth from west to east
therefore places to the east of a given
longitude will have sunrise first the
earth takes 24 hours to cover 316
meridians this means that it covers 15
degree meridians in one R or one region
in four minutes based on this
calculation the difference in time of
different places is calculated earlier
[Music]
people thought that the whole world
should set the clock at the same time
but this was not possible as the Sun
does not shine on all parts of the world
at the same time
in 1884 scientists solve this issue by
dividing the world into 24 time zones
each zone is approximately 15 degree
longitude by velch England was chosen to
be the location for Universal Time
because it's located along the Prime
Meridian the time in each zone is
calculated by this universe of time also
known as a Greenwich Mean Time
for example Chicago is GMT minus 6 hours
so when it's 7 p.m. in Greenwich it is
1:00 p.m. in Chicago the local time of a
place is fixed on the basis of the
Akron's movement of the Sun when the Sun
shines the exactly overhead it is midday
of 12:00 noon at that place midday
occurs at different times and different
meridians so the local time varies from
one region to another
[Music]
Standard Time is the time in any of the
24 time zones into which the earth is
divided the Indian Standard Time is the
time observed throughout India for Sri
Lanka the Indian Standard time is
calculated on the basis of 82 and a half
degrees east longitude which is just
west of the town where support me
Allahabad the longitudinal difference
between Mirzapur and drainage is 5 our
30 minutes as the standard me region of
India is towards the east of the Prime
Meridian the standard time of India is 5
hours 30 minutes ahead of GMT
[Music]
students we can also check out other
social science lessons through the links
given on the screen now go quickly try
to locate the parallel and in the region
that pass through your city from the
Atlas thank you