Math for converting coordinates

Discussion created by Nighteyez07 on Feb 4, 2013
Latest reply on Jun 14, 2019 by kittend.awu
I know that I can use the geometryService to convert between 2 different coordinate systems, but I'd like to reduce the number of calls made to the server to update coordinates. I'm trying to convert from wkid 32149 (NAD_1983_StatePlane_Washington_South_FIPS_4602) to Latitude/Longitude 4326. Does anyone know where I can find the math so I can create my own function to convert the coordinates? I've tried my Google Kung Fu, but come up dry.