set_theta_zero_location(self, loc, offset=0.0)
This simply calls set_theta_offset
with the correct value in radians.
May be one of "N", "NW", "W", "SW", "S", "SE", "E", or "NE".
An offset in degrees to apply from the specified loc. Note: this offset is always applied counter-clockwise regardless of the direction setting.
Set the location of theta's zero.
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