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AD2XY
| Compute X and Y from native coordinates and a FITS astrometry structure |
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ADD_DISTORT
| Add the distortion parameters in an astrometry structure to a FITS header. |
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ADSTRING
| Return RA and Dec as character string(s) in sexigesimal format. |
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ADXY
| Use a FITS header to convert astronomical to pixel coordinates |
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AIRTOVAC
| Convert air wavelengths to vacuum wavelengths |
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AITOFF
| Convert longitude, latitude to X,Y using an AITOFF projection. |
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AITOFF_GRID
| Produce an overlay of latitude and longitude lines over a plot or image |
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AL_LEGEND
| Create an annotation legend for a plot. |
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AL_LEGENDTEST
| Demo program to show capabilities of the al_legend procedure. |
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ALTAZ2HADEC
| Convert Horizon (Alt-Az) coordinates to Hour Angle and Declination. |
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APER
| Compute concentric aperture photometry (adapted from DAOPHOT) |
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ARCBAR
| Draw an arc bar on an image showing the astronomical plate scale |
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ARROWS
| To display 'weathervane' directional arrows on an astronomical image |
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ASINH
| Return the inverse hyperbolic sine of the argument |
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ASTDISP
| Print astronomical and pixel coordinates in a standard format |
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ASTRO
| Interactive utility for precession and coordinate conversion. |
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ASTROLIB
| Add the non-standard system variables used by the IDL Astronomy Library |
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AUTOHIST
| Draw a histogram using automatic bin-sizing. |
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AVG
| Return the average value of an array, or 1 dimension of an array |
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BARYVEL
| Calculates heliocentric and barycentric velocity components of Earth. |
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BIWEIGHT_MEAN
| Calculate the center and dispersion (like mean and sigma) of a distribution using bisquare weighting. |
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BLINK
| To allow the user to alternatively examine two or more windows within a single window. |
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BLKSHIFT
| Shift a block of data to a new position in a file (possibly overlapping) |
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BOOST_ARRAY
| Append one array onto a destination array |
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BOXAVE
| Box-average a 1 or 2 dimensional array. |