This form allows you to make a plot of airmass vs. time for a given astronomical target, by specifying either the coordinates, or an object name to be resolved by Simbad or NED.
This code was created by Eric Jensen. This page is maintained by Mittelman Observatory at Middlebury College. This tool is part of the Tapir package (upstream primary site, this mirror site) for planning astronomical observations; the source code is freely available.
The upstream primary site includes a more robust set of tools optimized for planning follow-up observations of periodic targets, especially transiting planets.
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