I'm reading the book "Practical Astronomy with your Calculator or Spreadsheet 4th Edition" implementing its formulas with C++.
Now, I have implemented formula 47 "Calculating orbits more precisely".
I get, with my implementation, that the right ascension and declination of the Sun on Greenwich date 10 March 1986 at 0 h UT is:
- right ascension: 23h 20m 1.73s = 350.007226656 = 23.333815110378847
- declination: -04º 18' 9.83" = -4.3027310799565921
I have checked it with two calculators:
In the Sun Ephemeris Calculator the values are:
- right ascension: 23h 19m 59.56s = 349.9981665°
- declination: -04° 18' 25.97" = -4.307214°
And in the Sun & Moon Position Calculator, the values are:
- right ascension: 23h 20m 1.6s = 350.007°
- declination: -04° 18' 10.8" = -4.303
All of them are different.
Do I have to be worried about it?