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Earth as a Sphere Essay

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Below is an essay on "Earth as a Sphere" from Anti Essays, your source for research papers, essays, and term paper examples.

EARTH AS A SPHERE
23.1 LONGITUDE
• Great Circles are circles with their centres at the centre of the earth.
• Meridians are semicircles connecting the North Pole and the South Pole, running on the
surface of the earth.
• The longitude of a meridian is determined by
(i)
the angle between the plane of the meridian with that of the Greenwich
Meridian
(ii)
its position to the left or to the right of the Greenwich Meridian.
• The longitude of a given point is written as x0 E or x0 W.
State the longitude for the points given below (NMS is the Greenwich Meridian)

Example:
Greenwich Meridian

Longitude for P = 35οW
Longitude for R = 60οE

a)
Longitude of P =
Longitude of R =

b)

Longitude of P =
Longitude of R =

Earth As A Sphere

1



The difference between two longitudes:
o If both longitudes are from the same sides of the Greenwich Meridian, (both E
or both W), then the difference between the two longitudes is the difference of
the angles.
o If the longitudes are from different sides of the Greenwich Meridian, (one E
and the other W), then the difference between the two longitudes is the sum of
the angles.
N
200 W

400 E

Q

P
600

Equator

S
The difference in longitudes = 400 – ( - 200) = 600.
Ex. 2 : Calculate the difference between the two given longitudes.
(Note : Sketch a diagram to help you understand better)

Example
1. 25 o E, 135 0 E

2.

40 0 W , 120 0 W

3.

10 0 E , 90 0 E

5.

125 0 E , 60 0 W

6.

15 0 E , 120 0 W

8.

10 0 E , 100 0 E

9.

115 0 E , 5 0 W

Difference : 1350 – 250 = 1100
4.

135 0 W , 20 0 E

Difference : 200 – (-1350)
=
7.

70 0 W , 10 0 E

Difference :

23.2 LATITUDE
• The Equator is a great circle with its plane that is perpendicular to the axis of the earth.
• Parallels of latitudes are circles with planes perpendicular to the axis of the earth and are
parallel to the equator.
• Latitude is the angle at the centre of the earth...

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APA Citation

Earth as a Sphere. Anti Essays. Retrieved December 17, 2018, from the World Wide Web: https://www.antiessays.com/free-essays/Earth-As-A-Sphere-766532.html