astutil: Astronomical utilities package
- airmass: Compute the airmass at a given elevation above the horizon
- astcalc: Astronomical calculator
- asthedit: Astronomical header editor
- astradius: Find images within a circle on the sky
- asttimes: Compute UT, Julian day, epoch, and sidereal time
- ccdtime: Compute time, magnitude, and signal-to-noise for CCDs
- galactic: Convert ra, dec to galactic coordinates
- gratings: Compute and print grating parameters
- keywpars: Translate the image header keywords used in ASTUTIL package
- pdm: Find periods in light curves by Phase Dispersion Minimization
- precess: Precess a list of astronomical coordinates
- rvcorrect: Compute radial velocity corrections
- setairmass: Compute effective airmass and middle UT for an exposure
- setjd: Compute and set Julian dates in images