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Matrix Software > Learng Astrology > Astrophysical Directions > Finder-Lists > Bibliography

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Bibliography

A word about the accuracy of the source catalogs used to prepare this book: In general the following is true: all optical objects are taken from source positions that are accurate to the second (s), when R.A. is measured in Hours-Minutes-Seconds (H-M-S) along the equator. For some of the non optical sources (x-ray), where discrete source location is still in the process of refinement, the input source may be accurate to a minute (m) of R.A., rather than a second.

For objects such as moving clusters and other extended sources, positions may be somewhat less precise, to the nearest degree. ALL positions are for the Epoch 1950.0 and were calculated using a value for the obliquity of 23°26'44.84" and a value for the angle between the Celestial Equator and the Galactic planes of 62°36'. All results are rounded to the nearest second of arc ("). Formulae and calculator routines (RPN & Algebraic) for the various coordinate transformations are available from Matrix Software. In general, points listed in this catalog were transformed to the alternate coordinate systems listed in one operation on the Hewlett-Packard 97 programmable calculator. The printed results were then hand checked against the original file cards for the objects. The final copy of each list was checked against the originals. The greatest possibility for error in the process involves the initial copying of the source position from the astronomical catalog to the file card. The authors would appreciate being informed of discovered errors. It is a little frightening to consider keeping track of the over 250,000 digits of coordinate listings contained in this book! We hope that having so many coordinate systems listed will encourage more astrologers to investigate the usefulness of examining cosmic structure in relation to natal charts.

Copyright (c) 1997-99 Michael Erlewine


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