I have been researching about Vincenty's formula for my new programme but through many books I didn't find any explanation about the upper case A, upper case B and u square . Does someone knows what are there meaning?
I have read the https://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf and https://www.movable-type.co.uk/scripts/latlong-vincenty.html but none of them explain what is upper A, upper B and u square, and where are they from. Thanks