Question

except for the equator,other parallels of latitudes are not great circles.why?

Answer 1

Answer:

accurate grid system to determine absolute and relative location. Absolute location is the exact x– and y– coordinate on the Earth. Relative location is the location of something relative to other entities. For example, when you use your GPS in your smart phone or car, say Google Maps, you put in an absolute location. But as you start driving, the device tells you to turn right or left relative to objects on the ground: “Turn left on exit 202” is relative to the other exit points. Or if you give directions to your house, you often use relative locations to help them understand how to get to your house.