| ADSTRING | Format RA and DEC as a character string |
| AIRTOVAC | Convert air wavelengths to vacuum wavelengths |
| AITOFF | Convert longitude,latitude to X,Y using Aitoff equal-area projection |
| AITOFF_GRID | Create an overlay grid using the AITOFF projection |
| ALTAZ2HADEC | Convert Horizon (Alt-Az) coordinates to Hour Angle and Declination |
| ARCBAR | Draw an arcbar over an image showing the astronomical plate scale |
| ARROWS | Given a FITS header, display a "weathervane" showing N-E orientation |
| ASTDISP | Display formatter for pixel + astronomical coordinates |
| ASTRO | Interactive driver to compute astronomical precession, or coordinate conversions (calls EULER and PRECESS). |
| BARYVEL | Compute components of barycentric Earth velocity, given Julian date |
| BPRECESS | Precess coordinates, proper motion from J2000 to B1950 |
| CALZ_UNRED | Deredden a galaxy spectrum using the Calzetti et al. (2000) formula |
| CCM_UNRED | Deredden a spectrum using the Cardelli, Clayton and Mathis (1989) parameterization. |
| CO_ABERRATION | Calculate changes to Ra and Dec due to aberration effects |
| CO_NUTATE | Calculate changes in RA and Dec due to nutation of the Earth's rotation |
| CO_REFRACT | Calculate correction to altitude due to atmospheric refraction |
| COSMO_PARAM | Derive a full set of cosmological parameters given a subset |
| CT2LST | Convert from civil time to local sidereal time |
| DATE | Convert day of year to a DY-MON-CCYY string (FITS standard) |
| DATE_CONV | Function to perform various date format conversions |
| DAYCNV | Convert from Julian Date to calendar date. |
| DEREDD | Deredden Stromgren indices (called by UVBYBETA) |
| ECI2GEO | Convert Earth-centered inertial coordinates to geographic coords |
| EQ2HOR | Convert celestial (ra-dec) coords to local horizon coords (alt-az). |
| EQPOLE | Convert longitude,latitude to X,Y using polar equal-area projection |
| EQPOLE_GRID | Create overlay grid using polar equal-area projection |
| EULER | Astronomical coordinate system conversions |
| FLUX2MAG | Convert from flux units to magnitudes |
| FM_UNRED | Deredden a spectrum using the Fitzpatrick & Massa (1998) parameterization. |
| GAL_UVW | Calculate the Galactic space velocity (U,V,W) of a star |
| GAL_FLAT | Correct a galaxy image for inclination effects. |
| GALAGE | Derive a galaxy age as a function of redshift for a cosmological model |
| GCIRC | Compute rigorous great circle distance |
| GEO2ECI | Convert geographic coordinates to Earth-centered inertial coords |
| GEO2GEODETIC | Convert from geographic to geodetic coordinates |
| GEO2MAG | Convert from geographic to geomagnetic coordinates |
| GEODETIC2GEO | Convert from geodetic to geographic coordinates |
| GET_COORDS | Read in angular input in decimal or sexigesimal format |
| GET_DATE | Get the current date in CCYY-MM-DD format (FITS standard) |
| GET_JULDATE | Get the current Julian date as a double precision scalar |
| GLACTC | Convert between Galactic (or SuperGalactic) and equatorial coordinates |
| GLACTC_PM | Convert between celestial and Galactic (or Supergalactic) proper motion |
| HADEC2ALTAZ | Converts Hour Angle and Declination to Horizon (alt-az) coordinates |
| HELIO | Compute (low-precision) heliocentric coordinates of the planets |
| HELIO_JD | Convert geocentric (reduced) Julian date to heliocentric Julian date |
| HELIO_RV | Compute radial velocity given binary star orbit parameters |
| HOR2EQ | Convert local horizon coords (alt-az) to equatorial (ra-dec). |
| IMCONTOUR | Contour plots with astronomical labeling (either RA,Dec or arc distance from the image center |
| IMF | Return values for a multi-component power law initial mass function |
| ISMEUV | Compute EUV optical depth due to photoionization of HI, HeI and HeII |
| JDCNV | Convert from calendar date to Julian date. |
| JPRECESS | Precess positions & proper motions from B1950 to J2000 |
| JULDATE | Convert from calendar date to reduced Julian date. |
| LSF_ROTATE | Create a 1-d convolution kernel to broaden a spectrum from a rotating star |
| LUMDIST | Return luminosity distance for a given redshift & cosmological model |
| MAG2GEO | Convert from geomagnetic to geographic coordinates |
| MAG2FLUX | Convert from magnitudes to flux units |
| MONTH_CNV | Convert a month name to the equivalent number or vice-versa |
| MOONPOS | Compute the RA and Dec (and distance) of the Moon at a given date |
| MPHASE | Compute illuminated fraction of the Moon's disk for given Julian dates |
| NUTATE | Compute the nutation in longitude and latitude for given Julian date(s) |
| OBSERVATORY | Return coordinates, altitude & time zones of an observatory |
| PLANCK | Returns a blackbody flux for a given effective temperature |
| PLANET_COORDS | Return low-precision RA and Dec of planets give a date(s) |
| POSANG | Compute the position angle between sources of specified RA and Dec |
| PRECESS | Precess RA and Dec to a new equinox |
| PRECESS_CD | Precess the PC (or CD) matrix in a FITS header to a new equinox |
| PRECESS_XYZ | Precess equatorial geocentric rectangular coordinates |
| PREMAT | Returns precession matrix from equinox 1 to equinox 2 |
| QDCB_GRID | Create overlay grid using COBE quad cube database coordinates |
| RADEC | Format RA, Dec as Hours,Min,Sec,Deg,Min,Sec |
| SIXTY | Convert decimal number to sexigesimal |
| SUNPOS | Compute the RA and Dec of the Sun at a given date |
| TEN | Convert sexigesimal number to decimal |
| TENV | Like TEN but will work on a vector of sexigesimal numbers. |
| TICPOS | Specify distance between tic marks for astronomical coordinates |
| TICLABELS | Create labels for astronomical coordinate tick marks |
| TICS | Compute the optimum distance between tic marks for astronomical labeling |
| TIC_ONE | Determine optimum position of the first tic in astronomical labeling |
| UVBYBETA | Use Stromgren indices to derive dereddened colors, metallicity, and effective Temperature. |
| VACTOAIR | Convert vacuum wavelengths to air wavelengths. |
| XYZ | Compute heliocentric rectangular coordinates at given Julian date. |
| YMD2DN | Convert year,month,day to day number of the year (in /jhuapl) |
| YDN2MD | Convert day number of the year to year, month,day |
| ZANG | Compute angular size as a function of redshift in a Friedman cosmology |
| ZENPOS | Compute the RA and Dec of the local zenith at a given date |