galpy.util.coords.rphi_to_dl_2d¶
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galpy.util.coords.
rphi_to_dl_2d
(R, phi, degree=False, ro=1.0, phio=0.0)[source]¶ NAME:
rphi_to_dl_2dPURPOSE:
convert Galactocentric radius and azimuth to distance and Galactic longitudeINPUT:
R - Galactocentric radius
phi - Galactocentric azimuth [rad/deg if degree]
KEYWORDS:
degree= (False): phi is in degrees rather than rad
ro= (1) Galactocentric radius of the observer
phio= (0) Galactocentric azimuth of the observer [rad/deg if degree]
OUTPUT:
(d,l); phi in degree if degreeHISTORY:
2012-01-04 - Written - Bovy (IAS)