Introduction:

The series of resolutions passed by the International Astronomical Union at its General Assemblies in 1997 and 2000 are the most significant set of international agreements in positional astronomy in several decades and arguably since the Paris conference of 1896. U.S. Naval Observatory Circular 179 explains these resolutions and provides guidance on their implementation. This publication is the successor to USNO Circular 163 (1982), which had a similar purpose for the IAU resolutions passed in 1976, 1979, and 1982. Circular 179 is intended for astronomers, geodesists, engineers, and others with an interest in positional astronomy.

Obtaining a Copy:

Download a Free Copy. USNO Circular 179 is available free of charge as a PDF document. Click on one of the links below to download the publication.

• USNO Circular 179 PDF (1.6M)
• USNO Circular 179_bw PDF optimized for black and white printing (1.6M)
• Errata & Updates PDF (56k)

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Order a Printed Booklet. A bound, printed version of the circular is available from the U.S. Naval Observatory for $10. To order this, or any USNO special publications, use the order form provided: print it out, fill it in, and mail it to the Naval Observatory with your payment. We cannot accept telephone, fax, or e-mail orders. Only checks or money orders (in U.S. currency, drawn on a U.S. bank) can be accepted for payment. Payment must be received before orders are filled.

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