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SLALIB -- Positional Astronomy Library
2.4-2
Programmer's Manual
Starlink User Note67.47
P.T.Wallace
25 January 2000
Retrieve hardcopy
Contents
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Abstract
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INTRODUCTION
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LINKING
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SUBPROGRAM SPECIFICATIONS
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SLA_ADDET - Add E-terms of Aberration
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SLA_AFIN - Sexagesimal character string to angle
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SLA_AIRMAS - Air Mass
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SLA_ALTAZ - Velocities etc. for Altazimuth Mount
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SLA_AMP - Apparent to Mean
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SLA_AMPQK - Quick Apparent to Mean
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SLA_AOP - Apparent to Observed
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SLA_AOPPA - Appt-to-Obs Parameters
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SLA_AOPPAT - Update Appt-to-Obs Parameters
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SLA_AOPQK - Quick Appt-to-Observed
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SLA_ATMDSP - Atmospheric Dispersion
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SLA_AV2M - Rotation Matrix from Axial Vector
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SLA_BEAR - Direction Between Points on a Sphere
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SLA_CAF2R - Deg,Arcmin,Arcsec to Radians
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SLA_CALDJ - Calendar Date to MJD
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SLA_CALYD - Calendar to Year, Day
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SLA_CC2S - Cartesian to Spherical
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SLA_CC62S - Cartesian 6-Vector to Spherical
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SLA_CD2TF - Days to Hour,Min,Sec
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SLA_CLDJ - Calendar to MJD
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SLA_CLYD - Calendar to Year, Day
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SLA_COMBN - Next Combination
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SLA_CR2AF - Radians to Deg,Arcmin,Arcsec
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SLA_CR2TF - Radians to Hour,Min,Sec
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SLA_CS2C - Spherical to Cartesian
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SLA_CS2C6 - Spherical Pos/Vel to Cartesian
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SLA_CTF2D - Hour,Min,Sec to Days
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SLA_CTF2R - Hour,Min,Sec to Radians
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SLA_DAF2R - Deg,Arcmin,Arcsec to Radians
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SLA_DAFIN - Sexagesimal character string to angle
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SLA_DAT - TAI-UTC
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SLA_DAV2M - Rotation Matrix from Axial Vector
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SLA_DBEAR - Direction Between Points on a Sphere
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SLA_DBJIN - Decode String to B/J Epoch (DP)
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SLA_DC62S - Cartesian 6-Vector to Spherical
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SLA_DCC2S - Cartesian to Spherical
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SLA_DCMPF - Interpret Linear Fit
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SLA_DCS2C - Spherical to Cartesian
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SLA_DD2TF - Days to Hour,Min,Sec
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SLA_DE2H -
to Az,El
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SLA_DEULER - Euler Angles to Rotation Matrix
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SLA_DFLTIN - Decode a Double Precision Number
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SLA_DH2E - Az,El to
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SLA_DIMXV - Apply 3D Reverse Rotation
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SLA_DJCAL - MJD to Gregorian for Output
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SLA_DJCL - MJD to Year,Month,Day,Frac
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SLA_DM2AV - Rotation Matrix to Axial Vector
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SLA_DMAT - Solve Simultaneous Equations
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SLA_DMOON - Approx Moon Pos/Vel
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SLA_DMXM - Multiply
Matrices
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SLA_DMXV - Apply 3D Rotation
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SLA_DPAV - Position-Angle Between Two Directions
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SLA_DR2AF - Radians to Deg,Min,Sec,Frac
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SLA_DR2TF - Radians to Hour,Min,Sec,Frac
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SLA_DRANGE - Put Angle into Range
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SLA_DRANRM - Put Angle into Range
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SLA_DS2C6 - Spherical Pos/Vel to Cartesian
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SLA_DS2TP - Spherical to Tangent Plane
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SLA_DSEP - Angle Between 2 Points on Sphere
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SLA_DT - Approximate ET minus UT
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SLA_DTF2D - Hour,Min,Sec to Days
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SLA_DTF2R - Hour,Min,Sec to Radians
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SLA_DTP2S - Tangent Plane to Spherical
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SLA_DTP2V - Tangent Plane to Direction Cosines
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SLA_DTPS2C - Plate centre from
and 
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SLA_DTPV2C - Plate centre from and x,y,z
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SLA_DTT - TT minus UTC
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SLA_DV2TP - Direction Cosines to Tangent Plane
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SLA_DVDV - Scalar Product
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SLA_DVN - Normalize Vector
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SLA_DVXV - Vector Product
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SLA_E2H - to Az,El
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SLA_EARTH - Approx Earth Pos/Vel
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SLA_ECLEQ - Ecliptic to Equatorial
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SLA_ECMAT - Form
Matrix
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SLA_ECOR - RV & Time Corrns to Sun
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SLA_EG50 - B1950 to Galactic
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SLA_EL2UE - Conventional to Universal Elements
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SLA_EPB - MJD to Besselian Epoch
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SLA_EPB2D - Besselian Epoch to MJD
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SLA_EPCO - Convert Epoch to B or J
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SLA_EPJ - MJD to Julian Epoch
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SLA_EPJ2D - Julian Epoch to MJD
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SLA_EQECL - J2000 to Ecliptic
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SLA_EQEQX - Equation of the Equinoxes
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SLA_EQGAL - J2000 to Galactic
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SLA_ETRMS - E-terms of Aberration
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SLA_EULER - Rotation Matrix from Euler Angles
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SLA_EVP - Earth Position & Velocity
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SLA_FITXY - Fit Linear Model to Two
![$[\,x,y\,]$](img20.gif)
Sets
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SLA_FK425 - FK4 to FK5
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SLA_FK45Z - FK4 to FK5, no P.M. or Parallax
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SLA_FK524 - FK5 to FK4
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SLA_FK52H - FK5 to Hipparcos
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SLA_FK54Z - FK5 to FK4, no P.M. or Parallax
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SLA_FK5HZ - FK5 to Hipparcos, no P.M.
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SLA_FLOTIN - Decode a Real Number
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SLA_GALEQ - Galactic to J2000
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SLA_GALSUP - Galactic to Supergalactic
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SLA_GE50 - Galactic to B1950
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SLA_GEOC - Geodetic to Geocentric
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SLA_GMST - UT to GMST
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SLA_GMSTA - UT to GMST (extra precision)
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SLA_GRESID - Gaussian Residual
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SLA_H2E - Az,El to
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SLA_H2FK5 - Hipparcos to FK5
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SLA_HFK5Z - Hipparcos to FK5, no P.M.
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SLA_IMXV - Apply 3D Reverse Rotation
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SLA_INTIN - Decode an Integer Number
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SLA_INVF - Invert Linear Model
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SLA_KBJ - Select Epoch Prefix
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SLA_M2AV - Rotation Matrix to Axial Vector
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SLA_MAP - Mean to Apparent
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SLA_MAPPA - Mean to Apparent Parameters
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SLA_MAPQK - Quick Mean to Apparent
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SLA_MAPQKZ - Quick Mean-Appt, no PM etc.
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SLA_MOON - Approx Moon Pos/Vel
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SLA_MXM - Multiply Matrices
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SLA_MXV - Apply 3D Rotation
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SLA_NUT - Nutation Matrix
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SLA_NUTC - Nutation Components
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SLA_OAP - Observed to Apparent
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SLA_OAPQK - Quick Observed to Apparent
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SLA_OBS - Observatory Parameters
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SLA_PA - to Parallactic Angle
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SLA_PAV - Position-Angle Between Two Directions
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SLA_PCD - Apply Radial Distortion
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SLA_PDA2H - H.A. for a Given Azimuth
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SLA_PDQ2H - H.A. for a Given P.A.
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SLA_PERMUT - Next Permutation
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SLA_PERTEL - Perturbed Orbital Elements
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SLA_PERTUE - Perturbed Universal Elements
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SLA_PLANEL - Planet Position from Elements
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SLA_PLANET - Planetary Ephemerides
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SLA_PLANTE -
![$[\,\alpha,\delta\,]$](img3.gif)
of Planet from Elements
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SLA_PM - Proper Motion
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SLA_POLMO - Polar Motion
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SLA_PREBN - Precession Matrix (FK4)
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SLA_PREC - Precession Matrix (FK5)
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SLA_PRECES - Precession
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SLA_PRECL - Precession Matrix (latest)
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SLA_PRENUT - Precession/Nutation Matrix
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SLA_PV2EL - Orbital Elements from Position/Velocity
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SLA_PV2UE - Position/Velocity to Universal Elements
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SLA_PVOBS - Observatory Position & Velocity
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SLA_PXY - Apply Linear Model
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SLA_RANDOM - Random Number
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SLA_RANGE - Put Angle into Range
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SLA_RANORM - Put Angle into Range
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SLA_RCC - Barycentric Coordinate Time
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SLA_RDPLAN - Apparent of Planet
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SLA_REFCO - Refraction Constants
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SLA_REFCOQ - Refraction Constants (fast)
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SLA_REFRO - Refraction
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SLA_REFV - Apply Refraction to Vector
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SLA_REFZ - Apply Refraction to ZD
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SLA_RVEROT - RV Corrn to Earth Centre
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SLA_RVGALC - RV Corrn to Galactic Centre
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SLA_RVLG - RV Corrn to Local Group
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SLA_RVLSRD - RV Corrn to Dynamical LSR
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SLA_RVLSRK - RV Corrn to Kinematical LSR
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SLA_S2TP - Spherical to Tangent Plane
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SLA_SEP - Angle Between 2 Points on Sphere
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SLA_SMAT - Solve Simultaneous Equations
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SLA_SUBET - Remove E-terms
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SLA_SUPGAL - Supergalactic to Galactic
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SLA_SVD - Singular Value Decomposition
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SLA_SVDCOV - Covariance Matrix from SVD
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SLA_SVDSOL - Solution Vector from SVD
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SLA_TP2S - Tangent Plane to Spherical
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SLA_TP2V - Tangent Plane to Direction Cosines
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SLA_TPS2C - Plate centre from and
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SLA_TPV2C - Plate centre from and x,y,z
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SLA_UE2EL - Universal to Conventional Elements
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SLA_UE2PV - Pos/Vel from Universal Elements
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SLA_UNPCD - Remove Radial Distortion
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SLA_V2TP - Direction Cosines to Tangent Plane
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SLA_VDV - Scalar Product
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SLA_VN - Normalize Vector
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SLA_VXV - Vector Product
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SLA_WAIT - Time Delay
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SLA_XY2XY - Apply Linear Model to an
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SLA_ZD - to Zenith Distance
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EXPLANATION AND EXAMPLES
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SUMMARY OF CALLS
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About this document ...
Next: Abstract
SLALIB --- Positional Astronomy Library
Starlink User Note 67
P. T. Wallace
25 January 2000
E-mail:ptw@star.rl.ac.uk