Astronomical fractions

Sexagesimal \Sex`a*ges"i*mal\, a. [Cf. F. sexag['e]simal.]
   Pertaining to, or founded on, the number sixty.
   [1913 Webster]

   {Sexagesimal fractions} or {Sexagesimal numbers} (Arith. &
      Alg.), those fractions whose denominators are some power
      of sixty; as, 1/60, 1/3600, 1/216000; -- called also
      {astronomical fractions}, because formerly there were no
      others used in astronomical calculations.

   {Sexagesimal arithmetic}, or {Sexagenary arithmetic}, the
      method of computing by the sexagenary scale, or by
      sixties.

   {Sexagesimal scale} (Math.), the sexagenary scale.
      [1913 Webster]
    

Astronomical \As`tro*nom"ic*al\ (-[i^]*kal), a. [L.
   astronomicus, Gr. 'astronomiko`s: cf. F. astronomique.]
   Of or pertaining to astronomy; in accordance with the methods
   or principles of astronomy. -- {As`tro*nom"ic*al*ly}, adv.
   [1913 Webster]

   {Astronomical clock}. See under {Clock}.

   {Astronomical day}. See under {Day}.

   {Astronomical fractions}, {Astronomical numbers}. See under
      {Sexagesimal}.
      [1913 Webster]