Page Title: Moon Calendar
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The latest release of Java for Windows has tightly restricted which applets are allowed to run in your browser. If you receive security warnings when visiting this page and the calendar does not appear, add the site to the list of permitted pages as follows:

Go to Control Panel(classic view) -> Java (32 bit); on the Security tab, click on 'Edit Site List...' In the dialog that appears, click 'Add', then enter the site URL: Click 'Ok', and verify that the URL listed matches. Click 'Apply' and 'OK', restart your browser, and you should now be able to visit the site and have the applet run. You may be asked to confirm that you want to run the applet, but it will no longer be blocked outright as the latest Java update does by default.

A new version of the calendar which does not depend on Java is available here.

The calendar below shows the phase of the moon for each day of the selected month. You can change the month and year to whatever you like between January 3999 BC and December 3999 AD.

Hovering your mouse over any day in the calendar will display a popup showing the moon's distance, phase and other information.

Instructions on what the various controls do is found below. There is also a reference section for those interested in the algorithms used.

Feel free to with your thoughts on the program.

Your browser is completely ignoring the &lt;applet&gt; tag!<p> Make sure you have Java enabled in your browser's Preferences or Options.


Ultimately, written instructions should be unnecessary; it ought to be intuitively obvious how to use the software.

Until then:

The original Moon Calendar program, which I wrote over ten years ago, has had a long run. But recent changes to Java have made it effectively unrunnable on modern machines. The version on this page solves that problem, and adds features such as high quality rendering and direct printing that were unavailable in the older version. If, for some reason, you still want to use the older version, it remains available here for the foreseeable future.

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