Re: GJD to HJD

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Re: GJD to HJD

> This matches within 4 seconds of Lew Cook's spread sheet. He claims 
> accuracy near 3 seconds. Can anyone check this with something known to be 
> perfect?

   I have done the same calculation.  I'm not sure whether the result
is perfect, though...

    Geo           Hel       Hel-Geo
52425.6907291 52425.692473 +0.001744
52431.6260590 52431.627245 +0.001186

    Geo           Bary      Bary-Geo
52425.6907291 52425.692474 +0.001745
52431.6260590 52431.627245 +0.001186

   BJD-HJD is incidentally almost zero in this case.  This is because
Jupiter and Saturn are located almost exactly 90 deg from this trial
position.  If one uses RA=6h Decl=0 instead, one obtains:

    Geo           Hel         Bary       BJD-HJD
52425.6907291 52425.685701 52425.685667 -0.000034
52431.6260590 52431.620865 52431.620831 -0.000034

Regards,
Taichi Kato