(a) What is a Great Circle?
(b) Outline three characteristics of a Great Circle.
(c) If the time at longitude 100°E was 5 a.m on Monday, 11th April 2011, what was the
(i) time at longitude 10°W
(ii) day at longitude 10°W
(iii) date at longitude 10°W.
(a) Meaning of Great circle: A Great Circle is an imaginary line that divides the earth into two equal halves.
(b) Cha characteristics of a Great Circle:
- Numerous on the globe.
- Runs either vertically or horizontally.
- Could run in any direction.
- They are the shortest distance between any two points on the earth's surface.
- The center of a Great Circle is also the center of the earth.
- Most Great Cires are equal in length.
- The equator is the only latitude that is a Great Circle
- Not always seen as a straight line on a map due to the earth's spherical shape.
(c) Calculation of time, day, and date:
(i) Difference in longitude = 100°+ 10° = 110°. If 1 hour = 15º
\(\therefore\) 110º = \(\frac{110}{15}\) x hr = 7\(\frac{1}{3}\) hours = 7 hours 20 minutes
Time at longitude 10°W is 7 hours 20 minutes behind 5 a.m. = 9:40 p.m.
(ii) Day at longitude 10ºW = Sunday.
(iii) Date at longitude 10°W = 10th April 201l.
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