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GLOBE : LATITUDES AND
LONGITUDES
FOR CLASS VI AND ix CBSE
PRESENTED BY
DEVINE 1812
WHAT ARE LONGITUDES?
 In order to locate them precisely, we must find out how far east or west
these places are from a given line of reference running from the North
Pole to the South Pole. These lines of references are called the meridians
of longitude
LONGITUDES
 Unlike parallels of latitude, all meridians are of equal length. Thus, it was
difficult to number the meridians. Hence, all countries decided that the
count should begin from the meridian which passed through Greenwich,
where the British Royal Observatory is located. This meridian is called the
Prime Meridian. Its value is 0° longitude and from it we count 180°
eastward as well as 180° westward. The Prime Meridian and 180° meridian
divide the earth into two equal halves, the Eastern Hemisphere and the
Western Hemisphere.
LONGITUDES
.
GRID
ALL FOUR HEMISPHERE
LONGITUDES AND TIME
 The best means of measuring time is by the movement of the earth, the
moon and the planets. The sun regularly rises and sets every day, and
naturally, it is the best time-keeper throughout the world. Local time can
be reckoned by the shadow cast by the sun, which is the shortest at noon
and longest at sunrise and sunset.
 Total longitude =360
 The earth competes spin on its axis = 24 Hrs
 360/24 = 15 LONGITUDES ON 1 HOUR
 OR IT TAKES 60 MINUTES TO COVER 15 LONGITUDES
 60/15 = 4 MINUTES TO COVER 1 LONGITUDES
 India is extended in appox 30 longitudes
 Total time 30 x4 = 120 minutes (2 hrs)
WHY DO WE HAVE STANDARD TIME?
The local time of places which are on different meridians are bound to
differ. For example, it will be difficult to prepare a time-table for trains
which cross several longitudes. In India, for instance, there will be a
difference of about 2 Hrs in the local times of “Guhar Moti” Gujarat
(extreme west) and Kibithu in Anjaw district of Arunachal
Pradesh (extreme east). It is, therefore, necessary to adopt the local
time of some central meridian of a country as the standard time for the
country. In India, the longitude of 82½° E (82° 30'E) is treated as the
standard meridian. The local time at this meridian is taken as the
standard time for the whole country. It is known
.
.
VOTE OF THANKS
 1 NCERT BOOKS
 2 INTERNERT AND GOOGLE
 3 ENCYCLOPEDIA BRITANICA
 4 MY VIEWERS

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Longitude time and ist 1

  • 1. GLOBE : LATITUDES AND LONGITUDES FOR CLASS VI AND ix CBSE PRESENTED BY DEVINE 1812
  • 2. WHAT ARE LONGITUDES?  In order to locate them precisely, we must find out how far east or west these places are from a given line of reference running from the North Pole to the South Pole. These lines of references are called the meridians of longitude
  • 3. LONGITUDES  Unlike parallels of latitude, all meridians are of equal length. Thus, it was difficult to number the meridians. Hence, all countries decided that the count should begin from the meridian which passed through Greenwich, where the British Royal Observatory is located. This meridian is called the Prime Meridian. Its value is 0° longitude and from it we count 180° eastward as well as 180° westward. The Prime Meridian and 180° meridian divide the earth into two equal halves, the Eastern Hemisphere and the Western Hemisphere.
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  • 8. LONGITUDES AND TIME  The best means of measuring time is by the movement of the earth, the moon and the planets. The sun regularly rises and sets every day, and naturally, it is the best time-keeper throughout the world. Local time can be reckoned by the shadow cast by the sun, which is the shortest at noon and longest at sunrise and sunset.  Total longitude =360  The earth competes spin on its axis = 24 Hrs  360/24 = 15 LONGITUDES ON 1 HOUR  OR IT TAKES 60 MINUTES TO COVER 15 LONGITUDES  60/15 = 4 MINUTES TO COVER 1 LONGITUDES  India is extended in appox 30 longitudes  Total time 30 x4 = 120 minutes (2 hrs)
  • 9. WHY DO WE HAVE STANDARD TIME? The local time of places which are on different meridians are bound to differ. For example, it will be difficult to prepare a time-table for trains which cross several longitudes. In India, for instance, there will be a difference of about 2 Hrs in the local times of “Guhar Moti” Gujarat (extreme west) and Kibithu in Anjaw district of Arunachal Pradesh (extreme east). It is, therefore, necessary to adopt the local time of some central meridian of a country as the standard time for the country. In India, the longitude of 82½° E (82° 30'E) is treated as the standard meridian. The local time at this meridian is taken as the standard time for the whole country. It is known
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  • 12. VOTE OF THANKS  1 NCERT BOOKS  2 INTERNERT AND GOOGLE  3 ENCYCLOPEDIA BRITANICA  4 MY VIEWERS