## 9.6.1 Earth as a Sphere, SPM Paper 2 (Long Questions)

Question 1: Diagram below shows four points P, Q, R and M, on the surface of the earth. P lies on longitude of 70oW. QR is the diameter of the parallel of latitude of 40o N. M lies 5700 nautical miles due south of P. (a) Find the position of R. (b) Calculate the shortest distance, in … Read more9.6.1 Earth as a Sphere, SPM Paper 2 (Long Questions)

## 9.4.3 Shortest Distance between Two Points

9.4.3 Shortest Distance between Two Points   1. The shortest distance between two points on the surface of the earth is the distance measured along a great circle.   Shortest distance between points D and M    = ( θ × 60 ) nautical miles Example: In the above diagram, calculate (a) The distance from P to … Read more9.4.3 Shortest Distance between Two Points

## 9.3 Location of a Place

9.3 Location of a Place   The location of a place is written as an ordered pair of latitude and longitude (latitude, longitude).   Example: Location of point P is (35o N, 27o E).

## 9.2 Latitudes

9.2 Latitudes   1. The great circle which is perpendicular to the earth’s axis is called equator. 2. A latitude is the angle at the centre of the Earth which is subtended by the arc of a meridian starting from the Equator to the parallel of latitude.   3. A circle which is perpendicular to the … Read more9.2 Latitudes

## 9.1 Longitudes

9.1 Longitudes   1.A great circle is a circle with the centre of the Earth as its centre. 2. A meridian is half of a great circle from the North pole to the South pole. 3. The longitude of the Greenwich Meridian is 0o. 4.The longitude of a meridian is determined by:    (a) The angle between … Read more9.1 Longitudes