pynrc.simul.dms.compute_local_roll

pynrc.simul.dms.compute_local_roll(pa_v3, ra_ref, dec_ref, v2_ref, v3_ref)[source]

Computes the position angle of V3 (measured N to E) at the reference point of an aperture.

Parameters

  • pa_v3 (float) – Position angle of V3 at (V2, V3) = (0, 0) [in deg]

  • v2_ref, v3_ref (float) – Reference point in the V2, V3 frame [in arcsec]

  • ra_ref, dec_ref (float) – RA and DEC corresponding to V2_REF and V3_REF, [in deg]

Returns

new_roll (float) – The value of ROLL_REF (in deg)