Spherical trigonometry is used to locate places on the earth's surface. All maps are based on trigonometry.
Global Positioning Systems (GPS) depends on three or more satellites picking up radio signals from your device. Trigonometry is then used to triangulate your position - that is, determine where you are in relation to each of the satellites. This gives your current location, from which you can navigate to your destination.
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Navigation takes place on the surface of a sphere, and it involves angles and distances. Spherical trigonometry was developed from plane trigonometry so that navigators could find their away over the Earth's surface.
trigonometry is often used to calculate distances from certain locations
There is no Contribution of Thales in the field of trignometry.........
Some would argue that the most complicated Field is Trigonometry.
libraries have trig books.