There are a few problems I’ve noticed on this page: https://www.aavso.org/spectroscopy-section-education-and-training
Link to Spectroscopy Forum is the old Forum (which I supposed is a useful archive) but perhaps there should be a link to the new place it lives.
Old: Spectroscopy | aavso
There are references to files on Google that don’t exist/have been deleted.
Past Presentations - Slit Rotation
https://docs.google.com/presentation/d/1nWPb7I2FpCOYtH4LSDM2i39-i7XJEldV/edit?usp=sharing&ouid=116196113575522331693&rtpof=true&sd=true
Slit Loss Calculator:
https://docs.google.com/spreadsheets/d/1SQ5tP5KERveVgC1JOyvq5iBHzOgPCFJQ/edit?usp=sharing&ouid=116196113575522331693&rtpof=true&sd=true
Thanks
Colin