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Angular and linear quantities may be specified in a variety of units. Linear quantities without unit specifications are assumed to be in millimeters. Angular quantities without unit specifications are assumed to be in radians. To specify a unit, pass the entire quantity as a string, appending the unit to the value. For example,
theta = 2.0 --> radians theta = '2.0 deg' --> degrees
The available angular units are ‘deg’, ‘degree’, ‘arcmin’, ‘arcminute’, ‘arcsec’, ‘arcsecond’, ‘milliarcsecond’, ‘rad’, ‘radian’, ‘milliradian’, ‘mrad’, ‘microradian’, ‘urad’.
The available linear units are ‘parsec’, ‘m’, ‘meter’, ‘decimeter’, ‘dm’, ‘centimeter’, ‘cm’, ‘millimeter’, ‘mm’, ‘micrometer’, ‘micron’, ‘um’, ‘nanometer’, ‘nm’, ‘Angstrom’, ‘angstrom’, ‘A’.