I'm using Postgis to find angles between sites. End users will use Google Earth to play with these results.
According to st_azimuth, I have exactly 315.002 degrees between these two points :
SELECT degrees(ST_Azimuth( st_setsrid(ST_Point(48.718544, -3.554562),4326), st_setsrid(ST_Point(48.116875, -2.95284),4326) )) AS degA_B
But when I verify them on Google Earth Pro, the result is not just slightly different : the ruler give 326.65° (!) AFAIK, Google Earth is WGS84 based too.
St_distance does'nt much agree with Google earh : the first 94.33333316013 km and the latter 80.37km
Frankly, I'm more confident on Postgis, but I don't know who to believe...
Have I made a mistake?