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A MATLAB Script for Predicting Lunar Occultations

  • aberatthis function corrects position vector for aberration of light.
  • anglesthis function converts a vector to angular quantities
  • applan1this function computes the apparent geocentric or topocentric place
  • apstar1this subroutine computes the geocentric or topocentric apparent place
  • atan3four quadrant inverse tangent
  • brentsolve for a single real root of a nonlinear equation
  • brootbracket a single root of a nonlinear equation
  • deg2dmsconvert decimal degrees to degrees,
  • etilt1this function computes quantities related to the orientation
  • findleap(jdate)find number of leap seconds for utc julian date
  • funargthis subroutine computes fundamental arguments (mean elements)
  • gast2this function computes the greenwich sidereal time
  • gdateconvert Julian date to Gregorian (calendar) date
  • geocenthis function moves the origin of coordinates from the
  • getdateinteractive request and input of calendar date
  • getobsinteractive request of observer coordinates
  • hrs2hmsconvert decimal hours to hours,
  • jd2str(jdate)convert Julian date to string equivalent
  • jplephemreads the jpl planetary ephemeris and gives
  • julianJulian date
  • minimaone-dimensional minimization
  • nutate1this function nutates equatorial rectangular coordinates from
  • occeventpredict occultation events
  • occfunc(x)occultation objective function
  • occprint(iflag, jdutc)print occultation conditions
  • precessthis function precesses equatorial rectangular coordinates from
  • propmothis function applies proper motion, including
  • readleapread leap seconds data file
  • readstar(filename)read star data file
  • solsyspurpose
  • sunfldthis function corrects position vector for the deflection
  • tdtimesthis function computes the terrestrial time (tt)
  • terrathis functions computes the position and velocity vectors of
  • utc2tdtconvert UTC julian date to TDT julian date
  • vectrsthis function converts angular quantities to vectors
  • loccult.m
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Be the first to rate this file! 4 Downloads (last 30 days) File Size: 538 KB File ID: #39357 Version: 1.1

A MATLAB Script for Predicting Lunar Occultations


David Eagle (view profile)


07 Dec 2012 (Updated )

Predict the local circumstances of lunar occultations of a planet or star.

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PDF document and a MATLAB script named loccult.m that can be used to predict the local circumstances of lunar occultations of a planet or star. The source ephemeris for this routine is a JPL binary ephemeris file. This application uses several functions ported to MATLAB from the Fortran version of the NOVAS (Naval Observatory Vector Astrometry Subroutines) source code developed at the United States Naval Observatory ( JPL binary ephemeris files for Windows compatible computers can be downloaded at

MATLAB release MATLAB 7.12 (R2011a)
Other requirements Requires platform specific MICE mex file and de421.bsp binary ephemeris file. Both are available at
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04 Feb 2013 1.1

Added MICE version of this script in the archive.

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