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# moon_illumination

`astroplan.``moon_illumination`(time, ephemeris=None)

  Calculate fraction of the moon illuminated.

  Parameters
    time `Time`

      Time of observation

    ephemeris str, optional

      Ephemeris to use. If not given, use the one set with `solar_system_ephemeris` (which is set to ‘builtin’ by default).

  Returns
    k float

      Fraction of moon illuminated