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Moon Phase Applet The moon icon indicates the current phase. Current Moon phase applet The applets is also computing the duration of lunations, i.e the time interval between successive New Moons. In addition the right column is showing the difference between the duration of that lunation and the mean value of 29 days, 12 hours, 44 minutes (29.5306 days). You may use the key "y" to increase the year, or shift key and "y" to decrease the year. Example: long duration short duration New Moon 2000 Dec. 25 New Moon 2001 Jan. 24 duration: 29 d, 19 h, 45 min (mean + 7 h 1 min) = 29.8229 days New Moon 2001 Jul. 20 New Moon 2001 Aug. 19 duration: 29 d, 7 h, 11 min (mean - 5 h 33 min) = 29.2993 days Press the "write" button to open the data window   Table: Biggest and smallest Full Moon A Blue Moon is the second full moon in a calendar month. Usually months have only one full moon, but occasionally a second one sneaks in. Full moons are separated by 29 days, while most months are 30 or 31 days long; so it is possible to fit two full moons in a single month. This happens every two and a half years, on average. Details How to get the applet version for offline use   Please visit my "MoonYear Applet" Visit my page: The Moon: orbit and phases   Please visit my: GeoAstro Applet Collection

Web Links

Inconstant Moon (Fourmilab, John Walker) Lunar Perigee and Apogee Calculator (Fourmilab, John Walker) A Whale of a Full Moon (NASA Space Science News) Astronomy Picture of the Day, December 22, 1999 (NASA) Warum ist der Mond am Horizont so groß? The Moon Illusion,An Unsolved Mystery. Explaining the moon illusion The Face of the Moon from Galileo to Apollo