External Links:
- Josh Walawender's IRAF tutorial
- Astronomical/Physical constants in CGS
- Stellar Classification Table
- SBO Clear Sky Clock
- SBO Website
- IRAF Project Website Documentation
- IRAF.net is a more comprehensive resource with a searchable archive of previous IRAF questions. It is now also a forum.
- NASA Astrophysics Data Service
- SIMBAD Astronomical Database
- NASA/IPAC Infrared Science Archive includes Digital Sky Survey, Sloan DSS, and 2MASS (infrared) finder charts
- A digital spectral classification atlas
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