I have implemented the formulas to convert AR and Dec into altitude and Azimuth in C++ following the book Practical Astronomy with your Calculator or Spreadsheet 4th Edition.
In the book there is an example to check if I have do it fine. This example works perfectly but I want to check if my formulas are correct.
I have use this page to check it but I get different minutes values in both altitude and azimuth values.
I have checked on that page that I get the same LST value, but ALT and AZ have different values. This data I have tested:
Altitude: -15° 27' 40" Azimuth: 273° 12' 34"
Do you know if there is another web page or program to check if the result of my formulas are correct?
Is this the same problem like the previous one (I'm not taking account for precession)?