Compare libraries providing J2000 to JNow for astrometry
example-output :
./testAstropy.py
Julian date: 2457943.45744910
Astropy JNOW (RA,Dec in degrees): 346.19817210,28.24505310
./comparelibNOVA-NOVAS-SOFA-ERFA
libNOVA UTC JNow 2457943.457450550981
NOVAS TT JNow 2457943.458251291886
Δ J2000 Δ NOVAS Δ SOFA Atco13
ra° ,dec° ra″ ,dec″ ra″ ,dec″ ra″ ,dec″
J2000 345.986294056000,28.150389198100
libNOVA equ_prec2 346.198171893533,28.245062055035 762.760, 340.822 -0.001, 0.032 257.624, 39.366
NOVAS precession 346.198172290866,28.245053132545 762.762, 340.790 257.625, 39.334
SOFA Atci13 346.200314432640,28.242916271123 770.473, 333.097 7.712, -7.693 265.337, 31.641
SOFA Atco13 346.126609694039,28.234127042381 505.136, 301.456 -257.625, -39.334
SOFA Atco13 NO r 346.200341996467,28.242875808109 770.573, 332.952 7.811, -7.838 265.436, 31.496
SOFA Atco13 NO eo 345.904450889408,28.234127042381 -294.635, 301.456 -1057.397, -39.334 -799.772, 0.000
ERFA Atco13 346.126609697111,28.234127044120 505.136, 301.456 -257.625, -39.334 0.000, 0.000