Sorgente           alfa       delta      distance

  Galactic Center     266.        -29.
  LMC                  82.        -69.
  SMC                  14.        -72.
  Andromeda            10.         42.
  M33                  22.5        30.
  M101                210.         55.
  M81                 150.         70.
  Virgo Cluster       190.         11.


               Astrophysical Constants

   1 sideral year       = 3.1558149984D7 s
   1 light year         = 9.4605E15 m
   1 astronomical unit  = 1.495985E11 m
   1 parsec             = 3.0856E16 m
   1 solar mass         = 1.989E30 kg
   Earth mass           = 5.977E24 kg
   Equatorial radius    = 6.37817E6 m


Other sites for data


Astronomical catalogs


Relativistic Astrophysics


Other interesting astonomical sites


Mantained by S. Frasca e P. Astone