This program runs under the Microsoft Windows Operating System (95, 98, 98 SE, ME, NT, 2000, XP, or newer), and has the "look and feel" of most applications for that enviroment.


    To use the program, the user doesn't need to know any astronomy, but a manual (with all the theory) is available on-line. In addition to the theory you will find some interesting items, such as video, schemes,...


    • Installation:


    The application EfeCalc are available for free download.

    To install the program you must download it and double click the downloaded file. The setup program will automatically starts and you only have to follow the easy steps.

    After the installation, a group named EfeCalc is created in the Start Menu. In this group you can find shortcuts for the application, the (on-line) help files, the read-me file, a PDF file with usefull information, and an uninstall icon.


    If the operating system where you are installing EfeCalc is Windows NT, 2000 or XP, you must have administrator privileges.


    • System Requirements:


Intel Pentium Processor at 200MHz (Pentium II - 350Mhz recommended)

Windows 95 or Windows NT 4.0 (or later); Recommended Windows XP

64Mb RAM (128 Mb recommended)

10Mb of harddisk free space

Soundboard (optional)

800x600 Resolution


    • Sound:


    EfeCalc ships with some sound files, however the user can choose to not install them (choosing the Compact Install).


    If the user installs the sounds, he will be able to deactivate them at any moment during the use of the program by doing th following:


    Click with the mouse right button on the icon of EfeCalc in the taskbar - . When you click, the following menu should appear (shown here in Windows XP):


    If the option "Turn Sound Off" is shown, then the sounds are activated; if it isn't (as in the image on the left) then the sounds are already deactivated. If you want to hear some noise, just click on "Turn Sound On".
    The program by default turns the sounds on (if the user has installed them) at the first use; however in the next session the program will start with the properties that it had upon exit.