addet - add the E-terms to a pre IAU 1976 mean place afin - convert a sexagesimal character string to radians (s.p.) airmas - compute the airmass at a given zenith distance altaz - compute altazimuth positions, velocities, accelerations amp - convert a geocentric apparent to post IAU 1976 mean place ampqk - convert a geocentric apparent to post IAU 1976 mean place aop - convert an apparent to observed place aoppa - pre-compute the set of apparent to observed place parameters aoppat - recompute the apparent to observed place sidereal time parameter aopqk - convert an apparent to observed place atmdsp - apply atmospheric dispersion terms to refraction coefficients av2m - compute a rotation matrix from an axial vector (s.p.) bear - compute the bearing of a point on a sphere w.r.t. another caf2r - convert degrees, arcminutes, and arcseconds to radians caldj - convert a Gregorian calendar date to a modified Julian date calyd - convert a Gregorian calendar date to a Julian calendar year, day cc2s - convert Cartesian to spherical coordinates (s.p.) cc62s - convert a 6-vector from Cartesian to spherical coordinates cd2tf - convert an interval in days to hours, minutes, and seconds cldj - convert a Gregorian calendar date to a modified Julian date clyd - convert a Gregorian calendar date a Julian calendar year, day cr2af - convert radians to degrees, arcminutes, and arcseconds cr2tf - convert radians to hours, minutes, and seconds cs2c - convert spherical to Cartesian coordinates (s.p.) cs2c6 - convert spherical position/velocity to Cartesian coordinates ctf2d - convert hours, minutes, and seconds to days ctf2r - convert hours, minutes, and seconds to radians daf2r - convert degrees, arcminutes, and arcseconds to radians (d.p) dafin - convert a sexagesimal character string to radians (d.p.) dat - compute difference between TAI and UTC in seconds dav2m - compute a rotation matrix from an axial vector (d.p) dbear - compute the bearing of a point on a sphere w.r.t. another (d.p.) dbjin - convert a character string to a Besselian/Julian epoch dc62s - convert Cartesian position/velocity to spherical coordinates (d.p.) dcc2s - convert Cartesian to spherical coordinates (d.p) dcmpf - convert linear fit coefficients to geometric parameters dcs2c - convert spherical to Cartesian coordinates (d.p) dd2tf - convert interval in days to hours, minutes, and seconds (d.p.) de2h - convert hour angle and declination to azimuth and elevation (d.p.) deuler - convert Euler angles to a rotation matrix (d.p.) dfltin - convert a character string to a floating point number (d.p.) dh2e - convert azimuth and elevation to hour angle and declination (d.p.) dimxv - apply a 3D reverse rotation to a 3-vector (d.p.) djcal - convert an MJD to a Gregorian calendar date djcl - convert an MJD to a Gregorian year, month, and day dm2av - convert a rotation matrix to an axial vector (d.p) dmat - solve a set of simultaneous equations (d.p.) dmoon - compute approximate geocentric position/velocity of moon (d.p.) dmxm - compute the product of two 3X3 matrices (d.p.) dmxv - multiple a 3-vector by a rotation matrix (d.p.) dpav - compute the bearing of a point on a sphere w.r.t. another (d.p.) dr2af - convert radians to degrees, arcminutes, and arcseconds (d.p) dr2tf - convert radians to hours, minutes, and seconds (d.p.) drange - normalize an angle to the range -pi <= angle <= pi (d.p.) dranrm - normalize an angle to the range 0 <= angle <= 2pi (d.p.) ds2c6 - convert spherical position/velocity to Cartesian coordinates (d.p.) ds2tp - project spherical coordinates onto the tangent plane (d.p) dsep - compute the angle between two points on a sphere (d.p.) dt - estimate the approximate difference between ET and UT in seconds dtf2d - convert hours, minutes, and seconds to days (d.p) dtf2r - convert hours, minutes, and seconds to radians (d.p.) dtp2s - convert tangent plane to spherical coordinates (d.p.) dtp2v - convert tangent plane coordinates to direction cosines (d.p.) dtps2c - compute the spherical coordinates of the tangent point (d.p.) dtpv2c - compute the direction cosines of the tangent point (d.p.) dtt - compute the difference between TT and UTC in seconds dv2tp - convert direction cosines to tangent plane coordinates (d.p) dvdv - compute the scalar product of 2 3-vectors (d.p.) dvn - normalize a 3-vector and compute the modulus (d.p.) dvxv - compute the vector product of 2 3-vectors (d.p.) e2h - convert hour angle and declination to azimuth and elevation (d.p.) earth - compute approximate heliocentric position/velocity of earth ecleq - convert from ecliptic to equatorial FK5 coordinates ecmat - compute the equatorial FK5 to ecliptic coordinates rotation matrix ecor - compute rv of earth and time correction to sun in given direction eg50 - convert equatorial FK4 to IAU 1958 galactic coordinates el2ue - convert osculating orbital elements into universal form epb - convert an MJD to a Besselian epoch epb2d - convert a Besselian epoch to an MJD epco - convert a Besselian/Julian epoch to match a given epoch epj - convert an MJD to a Julian epoch epj2d - convert a Julian epoch to an MJD eqecl - convert equatorial FK5 to ecliptic coordinates eqeqx - compute the equation of the equinoxes eqgal - convert equatorial FK5 to IAU 1958 galactic coordinates etrms - compute the E-terms vector euler - convert Euler angles to a rotation matrix (s.p.) evp - compute the barycentric/heliocentric velocity/position of earth fitxy - fit a linear model to 2 sets of [x,y] coordinates fk425 - convert equatorial FK4 to FK5 coordinates fk45z - convert equatorial FK4 to FK5 coordinates excluding proper motion fk524 - convert equatorial FK5 to FK4 coordinates fk54z - convert equatorial FK5 to FK4 coordinates excluding proper motion fk52h - convert equatorial FK5 to ICRS coordinates fk5hz - Convert equatorial FK5 to ICRS coordinates (0 ICRS proper motions) flotin - convert a character string to a floating point number galeq - convert IAU 1958 galactic to equatorial FK5 coordinates galsup - convert IAU 1958 galactic to deVaucouleurs supergalactic coordinates ge50 - convert IAU 1958 galactic to equatorial FK4 coordinates geoc - convert geodetic to geocentric position gmst - convert from UT1 to GMST gmsta - convert from UT1 to GMST while minimizing rounding errors h2e - convert azimuth and elevation to hour angle and declination (s.p.) h2fk5 - Convert equatorial ICRS to FK5 coordinates hfk5z - Convert equatorial ICRS to FK5 coordinates (0 ICRS proper motions) imxv - apply a 3D reverse rotation to a 3-vector (s.p.) intin - convert a character string into an integer invf - invert the linear model computed from 2 sets of [x,y] coordinates kbj - select the epoch prefix B or J m2av - convert a rotation matrix to an axial vector (s.p.) map - convert a post IAU 1976 mean to geocentric apparent place mappa - precompute the set of mean to geocentric apparent place parameters mapqk - convert a post IAU 1976 mean to geocentric apparent place mapqkz - convert a post IAU 1976 mean to geocentric apparent place moon - compute approximate geocentric position/velocity of moon mxm - compute the product of two 3X3 matrices (s.p.) mxv - multiply a 3-vector by a rotation matrix (s.p.) nut - compute the nutation matrix for a given date nutc - compute the nutation components for a given date oap - convert from observed to apparent place oapqk - convert from observed to apparent place obs - look up an entry in a list of groundbased observing stations pa - compute the parallactic angle from the hour angle and declination pav - compute the bearing of a point on a sphere w.r.t. another pcd - apply pincushion/barrel distortion to tangent plane coordinates pda2h - compute the hour angle corresponding to a given azimuth pdq2h - compute the hour angle corresponding to a given parallactic angle pertel - update osculating orbital elements by applying perturbations pertue - update universal elements by applying perturbations planel - compute the approximate heliocentric position/velocity of a planet planet - compute the approximate heliocentric position/velocity of a planet plante - compute approximate topocentric apparent position of a planet pm - apply the correction for proper motion to a star polmo - correct site longitude and latitude for polar motion prebn - compute the FK4 matrix of precession between two epochs prec - compute the FK5 matrix of precession between two epochs preces - precess coordinates in either the FK4 or FK5 systems precl - compute the longterm matrix of precession between two epochs precss - precess coordinates in either the FK4 or FK5 systems prenut - compute the FK5 matrix of precession and nutation pv2el - convert J2000 position and velocity to osculating elements pv2ue - convert instantaneous position and velocity to universal element set pvobs - compute the geocentric position / velocity of an observing station pxy - apply a linear model to a set of expected and measured [x,y] range - normalize an angle to the range -pi <= angle <= pi (s.p.) ranorm - normalize an angle to the range 0 <= angle <= 2pi (s.p.) rcc - compute the difference between TDB and TT in seconds rdplan - compute approximate topocentric apparent position of a planet refco - compute the refraction coefficients refcoq - compute the refraction coefficients (fast version) refro - compute the atmospheric refraction for optical and radio wavelengths refv - apply the refraction correction to a Cartesian 3-vector refz - apply the refraction correction to a zenith distance rverot - compute the earth rotation velocity component in a given direction rvgalc - compute the dynamical LSR velocity component in a given direction rvlg - compute the solar velocity component in a given direction rvlsrd - compute the peculiar solar velocity component in a given direction rvlsrk - compute the standard solar velocity component in a given direction s2tp - project spherical coordinates onto the tangent plane (s.p.) sep - compute the angle between two points on a sphere (s.p.) smat - solve a set of simultaneous equations (s.p.) subet - remove the E-terms from a pre IAU 1976 catalog position supgal - convert deVaucouleurs supergalactic to IAU 1958 galactic coordinates svd - compute the SVD factorization of a matrix svdcov - compute the covariance matrix from the SVD factorization svdsol - solve a set of simultaneous equations using SVD factorization tp2s - convert tangent plane to spherical coordinates (s.p.) tp2v - convert tangent plane coordinates to direction cosines (s.p.) tps2c - compute the spherical coordinates of the tangent point (s.p.) tpv2c - compute the direction cosines of the tangent point (s.p.) ue2el - convert universal elements into heliocentric osculating elements ue2pv - compute heliocentric position and velocity from universal form unpcd - remove pincushion/barrel distortion from distorted coordinates v2tp - convert direction cosines to tangent plane coordinates (s.p.) vdv - convert the scale production of two 3-vectors (s.p.) vn - normalize a 3-vector and compute the modulus (s.p.) vxv - compute the vector product of two 3-vectors (s.p.) xy2xy - apply a computed linear model to a set of [x,y] zd - convert hour angle and declination to zenith distance