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<H1><A NAME="SECTION00050000000000000000">
EXPLANATION AND EXAMPLES</A>
</H1>
To guide the writer of positional-astronomy applications software,
this final chapter puts the SLALIB routines into the context of
astronomical phenomena and techniques, and presents a few
``cookbook'' examples
of the SLALIB calls in action. The astronomical content of the chapter
is not, of course, intended to be a substitute for specialist text-books on
positional astronomy, but may help bridge the gap between
such books and the SLALIB routines. For further reading, the following
cover a wide range of material and styles:
<UL>
<LI> <I>Explanatory Supplement to the Astronomical Almanac</I>,
ed. P.Kenneth Seidelmann (1992), University Science Books.
<LI> <I>Vectorial Astrometry</I>, C.A.Murray (1983), Adam Hilger.
<LI> <I>Spherical Astronomy</I>, Robin M.Green (1985), Cambridge
University Press.
<LI> <I>Spacecraft Attitude Determination and Control</I>,
ed. James R.Wertz (1986), Reidel.
<LI> <I>Practical Astronomy with your Calculator</I>,
Peter Duffett-Smith (1981), Cambridge University Press.
</UL>
Also of considerable value, though out of date in places, are:
<UL>
<LI> <I>Explanatory Supplement to the Astronomical Ephemeris
and the American Ephemeris and Nautical Almanac</I>, RGO/USNO (1974),
HMSO.
<LI> <I>Textbook on Spherical Astronomy</I>, W.M.Smart (1977),
Cambridge University Press.
</UL>
Only brief details of individual SLALIB routines are given here, and
readers will find it useful to refer to the subprogram specifications
elsewhere in this document. The source code for the SLALIB routines
(available in both Fortran and C) is also intended to be used as
documentation.
<P>
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<LI><A NAME="tex2html2396" HREF="node198.html#SECTION00051000000000000000">
Spherical Trigonometry</A>
<UL>
<LI><A NAME="tex2html2397" HREF="node199.html#SECTION00051100000000000000">
Formatting angles</A>
</UL>
<LI><A NAME="tex2html2398" HREF="node200.html#SECTION00052000000000000000">
Vectors and Matrices</A>
<UL>
<LI><A NAME="tex2html2399" HREF="node201.html#SECTION00052100000000000000">
Using vectors</A>
</UL>
<LI><A NAME="tex2html2400" HREF="node202.html#SECTION00053000000000000000">
Celestial Coordinate Systems</A>
<LI><A NAME="tex2html2401" HREF="node203.html#SECTION00054000000000000000">
Precession and Nutation</A>
<UL>
<LI><A NAME="tex2html2402" HREF="node204.html#SECTION00054100000000000000">
SLALIB support for precession and nutation</A>
</UL>
<LI><A NAME="tex2html2403" HREF="node205.html#SECTION00055000000000000000">
Mean Places</A>
<LI><A NAME="tex2html2404" HREF="node206.html#SECTION00056000000000000000">
Epoch</A>
<LI><A NAME="tex2html2405" HREF="node207.html#SECTION00057000000000000000">
Proper Motion</A>
<LI><A NAME="tex2html2406" HREF="node208.html#SECTION00058000000000000000">
Parallax and Radial Velocity</A>
<LI><A NAME="tex2html2407" HREF="node209.html#SECTION00059000000000000000">
Aberration</A>
<LI><A NAME="tex2html2408" HREF="node210.html#SECTION000510000000000000000">
Different Sorts of Mean Place</A>
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Mean Place Transformations</A>
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Mean Place to Apparent Place</A>
<LI><A NAME="tex2html2411" HREF="node213.html#SECTION000513000000000000000">
Apparent Place to Observed Place</A>
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Refraction</A>
<LI><A NAME="tex2html2413" HREF="node215.html#SECTION000513200000000000000">
Efficiency considerations</A>
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The Hipparcos Catalogue and the ICRS</A>
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Timescales</A>
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Atomic Time: TAI</A>
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Universal Time: UTC, UT1</A>
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Sidereal Time: GMST, LAST</A>
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Dynamical Time: TT, TDB</A>
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Calendars</A>
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Geocentric Coordinates</A>
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Ephemerides</A>
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Radial Velocity and Light-Time Corrections</A>
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Focal-Plane Astrometry</A>
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Numerical Methods</A>
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<ADDRESS>
<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
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