where λ is the longitude from the central meridian of the projection, and φ is the latitude. Meridians are thus about 0.733 the length of the equator. This browser is not supported by Wikiwand :( Wikiwand requires a browser with modern capabilities in order to provide you with the best reading experience.Please download and use one of the following browsers: An extension you use may be preventing Wikiwand articles from loading properly. If you’re using HTTPS Everywhere or you’re unable to access any article on Wikiwand, please consider switching to HTTPS (https://www.wikiwand.com). An extension you use may be preventing Wikiwand articles from loading properly. If you are using an Ad-Blocker, it might have mistakenly blocked our content. You will need to temporarily disable your Ad-blocker to view this page. Source.