Sky offset type definition

[Eric.VanAlst@…]

In SDR-02 paragraph 5.3.4, the types of offset has a TBD of [Linear,
Spherical/Arcsec, Spherical/Degrees,etc]. What should the valid types be?

[eugene]

I want to change the format of these functions slightly to be more consistent
with our other structures. we need to specify two quantities: offset mode and
offset units:

psSphere *psSphereSetOffset(const psSphere *restrict position1,

const psSphere *restrict offset,
psSphereOffsetMode mode,
psSphereOffsetUnit unit);

where:

typedef enum {

PS_SPHERICAL;
PS_LINEAR;

} psSphereOffsetMode;

typedef enum {

PS_ARCSEC;
PS_ARCMIN;
PS_DEGREE;
PS_RADIAN;

} psSphereOffsetUnit;