update ncl index

Author: cyschneck

ncl/ncl_index/ncl-index-table.csv

@@ -50,3 +50,4 @@ NCL Function,Description,Python Equivalent,Notes
 `satvpr_temp_fao56 <https://www.ncl.ucar.edu/Document/Functions/Crop/satvpr_temp_fao56.shtml>`__,"Compute saturation vapor pressure using temperature as described in FAO 56","``geocat.comp.saturation_vapor_pressure()``",`example notebook <../ncl_entries/meteorology.ipynb#satvpr-temp-fao56>`__
 `satvpr_tdew_fao56 <https://www.ncl.ucar.edu/Document/Functions/Crop/satvpr_tdew_fao56.shtml>`__,"Compute actual saturation vapor pressure as described in FAO 56","``geocat.comp.actual_saturation_vapor_pressure()``",`example notebook <../ncl_entries/meteorology.ipynb#satvpr-tdew-fao56>`__
 `satvpr_slope_fao56 <https://www.ncl.ucar.edu/Document/Functions/Crop/satvpr_slope_fao56.shtml>`__," Compute the slope of the saturation vapor pressure curve as described in FAO 56","``geocat.comp.saturation_vapor_pressure_slope()``",`example notebook <../ncl_entries/meteorology.ipynb#satvpr-slope-fao56>`__
+`csc2s <https://www.ncl.ucar.edu/Document/Functions/Built-in/csc2s.shtml>`__,"Converts Cartesian coordinates on a unit sphere to spherical coordinates (lat/lon)","``astropy.CartesianRepresentation().represent_as(SphericalRepresentation)``",`example notebook <../ncl_entries/great_circle.ipynb#csc2s>`__