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Astronomical Applications Department, U.S. Naval Observatory - NOVASC (Page 5)

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Astronomical Applications Department, U.S. Naval Observatory - NOVASC
3. Function Overview
The following functions are contained in file novas.c:
Entry name
Level
Purpose
supervisory
Computes the geocentric apparent place of a star, given its J2000.0 catalog mean place.
supervisory
Computes the topocentric apparent place of a star, given its J2000.0 catalog mean place
and geographic location of observer.
supervisory
Computes the geocentric apparent place of a planet or other solar system body.
supervisory
Computes the topocentric apparent place of a planet or other solar system body, given
geographic location of observer.
supervisory
Computes the "virtual place" of a star, given its J2000.0 catalog mean place.
supervisory
Computes the "local place" of a star, given its J2000.0 catalog mean place and
geographic location of observer.
supervisory
Computes the "virtual place" of a planet or other solar system body.
supervisory
Computes the "local place" of a planet or other solar system body, given geographic
location of observer.
supervisory
Computes the astrometric place of a star, given its J2000.0 catalog mean place.
supervisory
Computes the astrometric place of a planet or other solar system body.
mean_star
supervisory
Computes the J2000.0 mean place of a star, given its apparent place.
supervisory
Computes Greenwich sidereal time, either mean or apparent.
pnsw
supervisory
Transforms arbitrary vector in rotating Earth-fixed (geographic) system to space-fixed
(J2000.0) system.
get_earth
utility
Provides barycentric and heliocentric position and velocity of the Earth at a TDT date.
spin
utility
Rotates vector by angle equal to sidereal time.
wobble
utility
Adjusts Earth-fixed vector for polar motion.
proper_motion
utility
Updates the position vector of a star to allow for its space motion.
geocentric
utility
Changes origin of coordinates from barycenter of solar system to center of mass of
Earth.
aberration
utility
Adjusts position vector for aberration of light due to motion of Earth.
utility
Applies precession to position vector.
nutate
utility
Applies nutation to position vector.
sun_field
utility
Adjusts position vector for deflection of light by Sun's gravitational field.
terra
utility
Converts geographic coordinates to geocentric position vector.
vector2radec
utility
Converts position vector to RA and declination.
angle2vector
utility
Converts RA, declination, and distance to a position vector.
starvectors
utility
Converts RA, declination, proper motion, etc., to position and velocity vectors.
calc_nutation
basic
Evaluates nutation series.
basic
Provides information on orientation of Earth's axis: obliquity, nutation parameters, etc.
convert_tdb2tdt
basic
Converts Terrestrial Dynamical Time (TDT) to Barycentric Dynamical Time (TDB).

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Other Documents:
novas c 2 doc, Beam Comp Example, moonpoly 2002, Newcomb, Newcomb Manual, Data Flow Diagrams, participant list, vondrak, zacharias, curvpath, pm AAS poster, Gaussian Distribution, Linear Least Squares, Sensitivity Integral, 3 D plot fits, lyap2, NAO 150, Rotate Vector, lyapcalc, wedges, Scifull, Precession Memo, Precession Maple, Curves 3 D, NOVAS 2004 Overview, NOVAS 2006 Overview, thesis, Ranson,


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