Calculate polynomial
Distance on a sphere
Convert longitude, latitude to X,Y using an AITOFF projection
Calculate changes in right ascension and declination due to nutation of the Earth's rotation
Calculate the Planck function in units of ergs/cm2/s/A
Calculate changes to right ascension and declination due to astronomical aberration
Calculates heliocentric and barycentric velocity components of Earth
astrolibR: Astronomy Users Library
Calculate correction to altitude due to atmospheric refraction
Calculate the Galactic space velocity (U,V,W) of a star
Compute the Right Ascension and Declination of the Moon at specified Julian date(s)
Integrand for cosmic age vs. redshift in standard cosmology
Precess equatorial geocentric rectangular coordinates
Convert vacuum wavelengths to air wavelengths
Convert from year, month, day to day number of year
Converts local horizon coordinates (alt-az) to equatorial coordinates(ra-dec)
Convert Gregorian dates to Julian days
Convert between a month name and the equivalent number
Compute position angle of source 2 relative to source 1
Transform between Galactic, celestial, and ecliptic coordinates
Derive dereddened colors, metallicity, and Teff from Stromgren colors
Precess celestial positions from B1950.0 (FK4) to J2000.0 (FK5) with proper motion
Convert air wavelengths to vacuum wavelengths
Integer divide
Convert Julian dates to Gregorian calendar dates
Derive full set of cosmological density parameters from a partial set
Convert a decimal number to sexigesimal
Calculate luminosity distance (in Mpc) of an object given its redshift
Determine the age of a galaxy given its redshift and a formation redshift
Convert horizon (Alt-Az) coordinates to hour angle and declination
Convert from astronomical magnitudes to flux (ergs/s/cm^2/A)
Convert from geographic/planetographic to geodetic coordinates
Convert from Local Civil Time to Local Mean Sidereal Time
Deredden a flux vector using the Fitzpatrick (1999) parameterization
Convert Hour Angle and Declination to Horizon (alt-az) coordinates
Convert a sexigesimal number or string to decimal
Computes rigorous great circle arc distances between points on the celestial sphere
Convert Right Ascension and declination from decimal to sexigesimal units
Convert from geodetic (or planetodetic) to geographic coordinates
Return the precession matrix needed to go from EQUINOX1 to EQUINOX2
Calculate geocentric X,Y, and Z and velocity coordinates of the Sun
Calculate the heliocentric radial velocity of a spectroscopic binary
Convert between celestial and Galactic (or Supergalactic) proper
motion and coordinates
Convert Right Ascension and declination to X,Y using an equal-area polar projection
Convert celestial (ra-dec) coords to local horizon coords (alt-az)
Convert geocentric (reduced) Julian date to heliocentric Julian date
Convert Earth-centered inertial coordinates to geographic spherical coordinates
Precess coordinates from EQUINOX1 to EQUINOX2
Force an angle into the range 0 <= ang < 360
Convert geographic spherical coordinates to Earth-centered inertial coordinates
Compute the continuum interstellar extreme ultraviolet (EUV) optical depth
Compute the Right Ascension and Declination of the Sun at specified Julian date(s)
Calculate the separation and position angle of a binary star
Deredden a flux vector using the Cardelli et al. (1989) parameterization
Compute an N-component power-law logarithmic stellar initial mass function
Create a 1-d convolution kernel to broaden a spectrum from a rotating star
Calculate low precision Right Ascension and declination for the planets given a date
Convert between celestial and Galactic (or Supergalactic) coordinates
Calculate the nutation in longitude and obliquity for a given Julian date
Integrand for luminosity distance calculation
Precess celestial positions from J2000.0 (FK5) to B1950.0 (FK4)
Calculate the true altitude of a celestial object from an observed altitude.
Deredden a galaxy spectrum using the Calzetti et al. (2000) recipe
Compute (low-precision) heliocentric coordinates for the planets
Convert from flux (ergs/s/cm^2/A) to astronomical magnitudes
Convert from calendar to Reduced Julian Date
Determine the angular size of an object as a function of redshift
Convert from year and day number of year to month and day of month
Return RA and Dec as character string(s) in sexigesimal format
Calculate the illuminated fraction of the Moon at given Julian date(s)
Deredden stellar Stromgren parameters given for a value of E(b-y)