as·tro·nom·i·cal /ˌæstrəˈnɑmɪkəl/
  (a.)天文學的,天文數字的,龐大的
  astronomical
  天文
  As·tro·nom·ic·al a.  Of or pertaining to astronomy; in accordance with the methods or principles of astronomy.  -- As*tro*nom*ic*al*ly, adv.
  Astronomical clock. See under Clock.
  Astronomical day. See under Day.
  Astronomical fractions, Astronomical numbers. See under Sexagesimal.
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  astronomical
       adj 1: relating or belonging to the science of astronomy;
              "astronomic telescope" [syn: astronomic]
       2: inconceivably large [syn: astronomic, galactic]