Latitude

This is an embedded cdf of the post "What's in a name". See the post for the details.
In brief,

• an eccentric ellipse is chosen to illustrate the difference between geocentric  (angle between movable black line and horizontal axis) and geographic latitude (angle between movable red line and horizontal axis)
• The difference between geographic and geocentric latitude is plotted against geocentric latitude in the bottom graphic (geographic-geocentric)