# cf.Units.islongitude

`Units.``islongitude`

  True if and only if the units are longitude units.

  This is the case if and only if the `units` attribute is one of `'degrees_east'`, `'degree_east'`, `'degree_E'`, `'degrees_E'`, `'degreeE'`, and `'degreesE'`.

  Note that units of `'degrees'` are not longitude units.

  See also

  `isdimensionless`, `islatitude`, `ispressure`, `isreftime`, `istime`

  Examples: |

      >>> Units('degrees_east').islongitude
      True
      >>> Units('degrees').islongitude
      False
      >>> Units('degrees_north').islongitude
      False
      >>> Units('kg').islongitude
      False
      >>> Units().islongitude
      False