|
Jeff,
when I first started using the SA, one of the comments from experienced users was to take a ref star spectra ("A" class if possible), from the same area of sky, at much the same time, as you catch the target spectra.
The aim being to compensate for the changing atmospherics, and recalibrate the instrument response.
I guess it all depends on how precise you want to be, and what you want to do with the data.
Mark
|