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Nutation series evaluation in NOVAS 3.0 / by George H. Kaplan.
- Format:
- Book
- Government document
- Author/Creator:
- Kaplan, George H., author.
- Series:
- United States Naval Observatory circular ; no. 181.
- United States Naval Observatory circular ; no. 181
- Language:
- English
- Subjects (All):
- United States Naval Observatory--Computer programs.
- United States Naval Observatory.
- Nutation--Computer programs.
- Nutation.
- Astrometry--Computer programs.
- Astrometry.
- Astronomy--Computer programs.
- Astronomy.
- Computer programs.
- Genre:
- Online resources.
- technical reports.
- Technical reports
- Technical reports.
- Physical Description:
- 1 online resource (10 pages) : color illustrations.
- Other Title:
- Nutation series evaluation in the Naval Observatory Vector Astrometry Software version 3.0
- Place of Publication:
- Washington, D.C. : U.S. Naval Observatory, December 2009.
- Summary:
- "This circular describes the computation of nutation in the Naval Observatory Vector Astrometry Software (NOVAS), version 3.0. A detailed description of NOVAS 3.0 may be found in USNO Circular 180 (Kaplan et al. 2009), which consists of user's guides for both the Fortran and C editions. Nutation is a small periodic oscillation of the Earth's axis with respect to a space-fixed reference system ("inertial space") caused by the torque of the Sun and Moon - and to a lesser extent, the other planets - on the Earth's equatorial bulge. Nutation is usually modeled by lengthy trigonometric series that, when evaluated for a specific date and time, yield the values of two ecliptic angles: the nutation in longitude, [Greek letters delta psi], and the nutation in obliquity, [Greek letters delta epsilon]. The evaluation of the nutation series is generally the most computationally intensive part of calculating the positions of celestial objects with respect to the traditional celestial coordinate system defined by the true equator and equinox of date. NOVAS provides several nutation series with different numbers of terms, which the user can select depending on the accuracy requirements."--Http://www.usno.navy.mil/USNO/astronomical-applications/publications/circ-181.
- Notes:
- "December 15, 2009."
- Includes bibliographical references.
- Description based on online resource; title from PDF cover (USNO website, viewed January 20, 2010).
- OCLC:
- 501047308
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