Tcl/Tk script to calculate the date of Easter according to the Julian, Gregorian, and Revised Julian (or Milanković) calendars for any given year.
Stand-alone executables (Starkits) are provided for Windows and Linux in the bin directory.
The Tcl/Tk script can be run directly, by changing directory to the CalcEaster.vfs directory, and executing tclsh main.tcl . This method presumes, of course, that Tcl/Tk has been installed on your operating system.