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Longitudes
- Imaginary lines
- Sketched vertically, connecting the North Pole and the South Pole.
- They are also called lines or meridians of longitude.
- These lines of longitude are seen as semi-circles.
Degrees of longitudes can be divided into minutes, and each minute of longitude can be further divided into seconds.
Important!
1° (degree) = 60' (minutes)
1' (minute) =60'' (seconds)
Important!
Prime Meridian: 0° line of longitude
Number of lines on either side of Prime meridian: 180 lines of longitude
Total lines of longitude: 360 lines.
- These lines converge at the poles.
- The 180° W and 180° E line of longitude are the same line.
- Eastern Longitudes: The lines of longitude found between the Prime Meridian(0°) and the\ 180° East line of longitude.
- Western Longitudes: The lines of longitude found between the Prime Meridian (0°) and the\ 180° West line of longitude.
Two opposite meridians form a great circle.
The lines of longitude are
| At Equator: | Semi circles covering 111 km |
| At 45° latitude | 79 km |
Important!
As the longitudes converge there is no space between them at the poles .
Eastern Hemisphere: The portion of the Earth that lies between the 0° line of longitude and the 180° East line of longitude.
Western Hemisphere: The portion of the Earth that lies between 0° line of longitude to 180°West line of longitude.
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