images taken from [url=https://www.google.com/url?sa=i&source=imgres&cd=&cad=rja&uact=8&ved=2ahUKEwik4fr648XkAhWJzKQKHcFKCXEQjB16BAgBEAM&url=https%3A%2F%2Fwww.physics.utoronto.ca%2F~jharlow%2Fteaching%2Fastrophys03%2Fgeodesic.html&psig=AOvVaw3FbI1jI4KtRnSpXWVHKKXu&ust=1568188033726452]here[/url][br]and [url=https://gisgeography.com/great-circle-geodesic-line-shortest-flight-path/]here[/url] (GISGeography)