Quick Observed to Apparent
CALL sla_OAPQK (TYPE, OB1, OB2, AOPRMS, RAP, DAP)
TYPE | C*(*) | type of coordinates – ‘R’, ‘H’ or ‘A’ (see below) |
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OB1 | D | observed Az, HA or RA (radians; Az is N=0, E=$9{0}^{\circ}$) |
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OB2 | D | observed zenith distance or $\delta $ (radians) |
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AOPRMS | D(14) | star-independent apparent-to-observed parameters: |
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(1) |
| geodetic latitude (radians) |
(2,3) |
| sine and cosine of geodetic latitude |
(4) |
| magnitude of diurnal aberration vector |
(5) |
| height (HM) |
(6) |
| ambient temperature (TDK) |
(7) |
| pressure (PMB) |
(8) |
| relative humidity (RH) |
(9) |
| wavelength (WL) |
(10) |
| lapse rate (TLR) |
(11,12) |
| refraction constants A and B (radians) |
(13) |
| longitude + eqn of equinoxes + “sidereal $\Delta $UT” (radians) |
(14) |
| local apparent sidereal time (radians) |
RAP,DAP | D | geocentric apparent $\left[\phantom{\rule{0.3em}{0ex}}\alpha ,\delta \phantom{\rule{0.3em}{0ex}}\right]$ |