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diff --git a/noao/astutil/doc/airmass.hlp b/noao/astutil/doc/airmass.hlp new file mode 100644 index 00000000..b35c461e --- /dev/null +++ b/noao/astutil/doc/airmass.hlp @@ -0,0 +1,31 @@ +.help airmass Mar84 noao.astutil +.ih +NAME +airmass -- compute the airmass at a given elevation above horizon +.ih +USAGE +airmass elevation +.ih +PARAMETERS +.ls elevation +Elevation above horizon in either degrees or radians. +.le +.ls scale = 750.0 +Scale factor of the Earth's atmosphere. +.le +.ls radians = no +Input elevation in radians instead of degrees. +.le +.ls airmass +On output, contains the computed airmass. +.le +.ih +EXAMPLE +Compute the airmass at an elevation of 30 degrees above the horizon + +.nf + cl> airmass 30 + airmass 1.996 at an elevation of 30. degrees (0.5236 radians) + above horizon +.fi +.endhelp |