https://www.thoughtco.com/the-four-spheres-of-the-earth-1435323 – Article

https://www.bing.com/images/search?view=detailV2&ccid=eIQjA79%2f&id=658826AEFDA85814B5DCD6CB30AC99016C3DED7C&thid=OIP.eIQjA79_xojoyHjofHQEdgHaD2&mediaurl=https%3a%2f%2fupload.wikimedia.org%2fwikipedia%2fcommons%2fthumb%2f6%2f62%2fLatitude_and_Longitude_of_the_Earth.svg%2f1280px-Latitude_and_Longitude_of_the_Earth.svg.png&exph=667&expw=1280&q=latitude+and+longitude&simid=608049660691744785&selectedIndex=0&ajaxhist=0

https://www.latlong.net/ – Calculate GPS

PowerPoint Link above ^