All arguments for these procedures and functions can be arrays. All require
existence of GeoParms variable. A default can be created by using
get_geoparms
utc2ut1(utc_real
)
Function. Returns UT1 in seconds, with UTC input in seconds.ut12gst(utc
Function. Returns GST in hours, inputs are in seconds.hourangle(gst
Function. Return hourangle in hours, with inputs also in hours.zenithangle(ha
Function. Return zenithangle in degrees with inputs ha in hours and dec in degrees.mirrorangle(ha
Function. Return mirrorangle in degrees with inputs ha in hours and dec in degrees.horizon2equatorial(coord
Function. Return equatorial coordinates for input horizontal coordinates X=east, Y=north, and Z=up.equatorial2horizon(coord
Function. Return horizon coordinates for input equatorial coordinates X=projection of local meridian on equator, Y=east, and Z=north.angle2horizon(coord
Function. Return horizon coordinates for input azimuth and elevation angle in degrees. No GeoParms required.equatorial2angle(coord
Function. Return hour angle in hours and declination in degrees for input equatorial coordinates. No GeoParms required.topostar,times
Compute apparent declinations and right ascensions for a list of times (in seconds UTC) and corresponding stars. (The arrays time and stars have to have the same number of elements therefore.) The startable is a standard STARBASE startable. The geoparms structure has to be loaded.calcastrom
Procedure. Compute astrometric variables in scans structure.calcvis
Procedure. Compute estimated visibilities, i.e. normalized visibilities.referencestation,station
Change reference station for data of specified class (default all classes) to station.precess,theta,jy,ra,dec,direction
Precess J2000 position angles (theta) to current Julian Year epoch (jy) for direction=1, from current to J2000 for direction=-1. (see: Heintz, "Double stars", p. 33). Input theta is in radians, dec in degrees, ra in hours; output is in radians.