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SLALIB -- Positional Astronomy Library
2.5-3
Programmer's Manual
Starlink User Note 67.70
P.T.Wallace
19 December 2005
Retrieve hardcopy
Contents
- Abstract
- INTRODUCTION
- LINKING
- SUBPROGRAM SPECIFICATIONS
- SLA_ADDET - Add E-terms of Aberration
- SLA_AFIN - Sexagesimal character string to angle
- SLA_AIRMAS - Air Mass
- SLA_ALTAZ - Velocities etc. for Altazimuth Mount
- SLA_AMP - Apparent to Mean
- SLA_AMPQK - Quick Apparent to Mean
- SLA_AOP - Apparent to Observed
- SLA_AOPPA - Appt-to-Obs Parameters
- SLA_AOPPAT - Update Appt-to-Obs Parameters
- SLA_AOPQK - Quick Appt-to-Observed
- SLA_ATMDSP - Atmospheric Dispersion
- SLA_AV2M - Rotation Matrix from Axial Vector
- SLA_BEAR - Direction Between Points on a Sphere
- SLA_CAF2R - Deg,Arcmin,Arcsec to Radians
- SLA_CALDJ - Calendar Date to MJD
- SLA_CALYD - Calendar to Year, Day
- SLA_CC2S - Cartesian to Spherical
- SLA_CC62S - Cartesian 6-Vector to Spherical
- SLA_CD2TF - Days to Hour,Min,Sec
- SLA_CLDJ - Calendar to MJD
- SLA_CLYD - Calendar to Year, Day
- SLA_COMBN - Next Combination
- SLA_CR2AF - Radians to Deg,Arcmin,Arcsec
- SLA_CR2TF - Radians to Hour,Min,Sec
- SLA_CS2C - Spherical to Cartesian
- SLA_CS2C6 - Spherical Pos/Vel to Cartesian
- SLA_CTF2D - Hour,Min,Sec to Days
- SLA_CTF2R - Hour,Min,Sec to Radians
- SLA_DAF2R - Deg,Arcmin,Arcsec to Radians
- SLA_DAFIN - Sexagesimal character string to angle
- SLA_DAT - TAI
UTC
- SLA_DAV2M - Rotation Matrix from Axial Vector
- SLA_DBEAR - Direction Between Points on a Sphere
- SLA_DBJIN - Decode String to B/J Epoch (DP)
- SLA_DC62S - Cartesian 6-Vector to Spherical
- SLA_DCC2S - Cartesian to Spherical
- SLA_DCMPF - Interpret Linear Fit
- SLA_DCS2C - Spherical to Cartesian
- SLA_DD2TF - Days to Hour,Min,Sec
- SLA_DE2H -
to Az,El
- SLA_DEULER - Euler Angles to Rotation Matrix
- SLA_DFLTIN - Decode a Double Precision Number
- SLA_DH2E - Az,El to
- SLA_DIMXV - Apply 3D Reverse Rotation
- SLA_DJCAL - MJD to Gregorian for Output
- SLA_DJCL - MJD to Year,Month,Day,Frac
- SLA_DM2AV - Rotation Matrix to Axial Vector
- SLA_DMAT - Solve Simultaneous Equations
- SLA_DMOON - Approx Moon Pos/Vel
- SLA_DMXM - Multiply
Matrices
- SLA_DMXV - Apply 3D Rotation
- SLA_DPAV - Position-Angle Between Two Directions
- SLA_DR2AF - Radians to Deg,Min,Sec,Frac
- SLA_DR2TF - Radians to Hour,Min,Sec,Frac
- SLA_DRANGE - Put Angle into Range
- SLA_DRANRM - Put Angle into Range
- SLA_DS2C6 - Spherical Pos/Vel to Cartesian
- SLA_DS2TP - Spherical to Tangent Plane
- SLA_DSEP - Angle Between 2 Points on Sphere
- SLA_DSEPV - Angle Between 2 Vectors
- SLA_DT - Approximate ET minus UT
- SLA_DTF2D - Hour,Min,Sec to Days
- SLA_DTF2R - Hour,Min,Sec to Radians
- SLA_DTP2S - Tangent Plane to Spherical
- SLA_DTP2V - Tangent Plane to Direction Cosines
- SLA_DTPS2C - Plate centre from
and 
- SLA_DTPV2C - Plate centre from and
- SLA_DTT - TT minus UTC
- SLA_DV2TP - Direction Cosines to Tangent Plane
- SLA_DVDV - Scalar Product
- SLA_DVN - Normalize Vector
- SLA_DVXV - Vector Product
- SLA_E2H - to Az,El
- SLA_EARTH - Approx Earth Pos/Vel
- SLA_ECLEQ - Ecliptic to Equatorial
- SLA_ECMAT - Form
Matrix
- SLA_ECOR - RV & Time Corrns to Sun
- SLA_EG50 - B1950 to Galactic
- SLA_EL2UE - Conventional to Universal Elements
- SLA_EPB - MJD to Besselian Epoch
- SLA_EPB2D - Besselian Epoch to MJD
- SLA_EPCO - Convert Epoch to B or J
- SLA_EPJ - MJD to Julian Epoch
- SLA_EPJ2D - Julian Epoch to MJD
- SLA_EPV - Earth Position & Velocity (high accuracy)
- SLA_EQECL - J2000 to Ecliptic
- SLA_EQEQX - Equation of the Equinoxes
- SLA_EQGAL - J2000 to Galactic
- SLA_ETRMS - E-terms of Aberration
- SLA_EULER - Rotation Matrix from Euler Angles
- SLA_EVP - Earth Position & Velocity
- SLA_FITXY - Fit Linear Model to Two
![$[\,x,y\,]$](img33.png)
Sets
- SLA_FK425 - FK4 to FK5
- SLA_FK45Z - FK4 to FK5, no P.M. or Parallax
- SLA_FK524 - FK5 to FK4
- SLA_FK52H - FK5 to Hipparcos
- SLA_FK54Z - FK5 to FK4, no P.M. or Parallax
- SLA_FK5HZ - FK5 to Hipparcos, no P.M.
- SLA_FLOTIN - Decode a Real Number
- SLA_GALEQ - Galactic to J2000
- SLA_GALSUP - Galactic to Supergalactic
- SLA_GE50 - Galactic to B1950
- SLA_GEOC - Geodetic to Geocentric
- SLA_GMST - UT to GMST
- SLA_GMSTA - UT to GMST (extra precision)
- SLA_GRESID - Gaussian Residual
- SLA_H2E - Az,El to
- SLA_H2FK5 - Hipparcos to FK5
- SLA_HFK5Z - Hipparcos to FK5, no P.M.
- SLA_IMXV - Apply 3D Reverse Rotation
- SLA_INTIN - Decode an Integer Number
- SLA_INVF - Invert Linear Model
- SLA_KBJ - Select Epoch Prefix
- SLA_M2AV - Rotation Matrix to Axial Vector
- SLA_MAP - Mean to Apparent
- SLA_MAPPA - Mean to Apparent Parameters
- SLA_MAPQK - Quick Mean to Apparent
- SLA_MAPQKZ - Quick Mean-Appt, no PM etc.
- SLA_MOON - Approx Moon Pos/Vel
- SLA_MXM - Multiply Matrices
- SLA_MXV - Apply 3D Rotation
- SLA_NUT - Nutation Matrix
- SLA_NUTC - Nutation Components
- SLA_NUTC80 - Nutation Components, IAU 1980
- SLA_OAP - Observed to Apparent
- SLA_OAPQK - Quick Observed to Apparent
- SLA_OBS - Observatory Parameters
- SLA_PA - to Parallactic Angle
- SLA_PAV - Position-Angle Between Two Directions
- SLA_PCD - Apply Radial Distortion
- SLA_PDA2H - H.A. for a Given Azimuth
- SLA_PDQ2H - H.A. for a Given P.A.
- SLA_PERMUT - Next Permutation
- SLA_PERTEL - Perturbed Orbital Elements
- SLA_PERTUE - Perturbed Universal Elements
- SLA_PLANEL - Planet Position from Elements
- SLA_PLANET - Planetary Ephemerides
- SLA_PLANTE -
![$[\,\alpha,\delta\,]$](img3.png)
of Planet from Elements
- SLA_PLANTU -
from Universal Elements
- SLA_PM - Proper Motion
- SLA_POLMO - Polar Motion
- SLA_PREBN - Precession Matrix (FK4)
- SLA_PREC - Precession Matrix (FK5)
- SLA_PRECES - Precession
- SLA_PRECL - Precession Matrix (latest)
- SLA_PRENUT - Precession-Nutation Matrix
- SLA_PV2EL - Orbital Elements from Position/Velocity
- SLA_PV2UE - Position/Velocity to Universal Elements
- SLA_PVOBS - Observatory Position & Velocity
- SLA_PXY - Apply Linear Model
- SLA_RANDOM - Random Number
- SLA_RANGE - Put Angle into Range
- SLA_RANORM - Put Angle into Range
- SLA_RCC - Barycentric Coordinate Time
- SLA_RDPLAN - Apparent
of Planet
- SLA_REFCO - Refraction Constants
- SLA_REFCOQ - Refraction Constants (fast)
- SLA_REFRO - Refraction
- SLA_REFV - Apply Refraction to Vector
- SLA_REFZ - Apply Refraction to ZD
- SLA_RVEROT - RV Corrn to Earth Centre
- SLA_RVGALC - RV Corrn to Galactic Centre
- SLA_RVLG - RV Corrn to Local Group
- SLA_RVLSRD - RV Corrn to Dynamical LSR
- SLA_RVLSRK - RV Corrn to Kinematical LSR
- SLA_S2TP - Spherical to Tangent Plane
- SLA_SEP - Angle Between 2 Points on Sphere
- SLA_SEPV - Angle Between 2 Vectors
- SLA_SMAT - Solve Simultaneous Equations
- SLA_SUBET - Remove E-terms
- SLA_SUPGAL - Supergalactic to Galactic
- SLA_SVD - Singular Value Decomposition
- SLA_SVDCOV - Covariance Matrix from SVD
- SLA_SVDSOL - Solution Vector from SVD
- SLA_TP2S - Tangent Plane to Spherical
- SLA_TP2V - Tangent Plane to Direction Cosines
- SLA_TPS2C - Plate centre from and
- SLA_TPV2C - Plate centre from and
- SLA_UE2EL - Universal to Conventional Elements
- SLA_UE2PV - Pos/Vel from Universal Elements
- SLA_UNPCD - Remove Radial Distortion
- SLA_V2TP - Direction Cosines to Tangent Plane
- SLA_VDV - Scalar Product
- SLA_VN - Normalize Vector
- SLA_VXV - Vector Product
- SLA_WAIT - Time Delay
- SLA_XY2XY - Apply Linear Model to an
- SLA_ZD - to Zenith Distance
- EXPLANATION AND EXAMPLES
- SUMMARY OF CALLS
- About this document ...
Next: Abstract
SLALIB --- Positional Astronomy Library
Starlink User Note 67
P. T. Wallace
19 December 2005
E-mail:starlink@jiscmail.ac.uk
Copyright © 2013 Science and Technology Facilities Council