Moon Tables 2001-2005

Times are Eastern Standard Time; in other words, they are already corrected for Daylight Saving Time (an hour has been added to Eastern Daylight Time [GMT -5 hours] for those times between the first Sunday in April and the third Sunday in October).

  
                             2001
        Full Moon                              New Moon
  Tue, Jan  9, 2001   3:26 PM      Wed, Jan 24, 2001   8:08 AM
  Thu, Feb  8, 2001   2:12 AM      Fri, Feb 23, 2001   3:23 AM
  Fri, Mar  9, 2001  12:24 PM      Sat, Mar 24, 2001   8:23 PM
  Sat, Apr  7, 2001  11:23 PM      Mon, Apr 23, 2001  11:28 AM
  Mon, May  7, 2001   9:53 AM      Tue, May 22, 2001  10:48 PM
  Tue, Jun  5, 2001   9:40 PM      Thu, Jun 21, 2001   7:59 AM
  Thu, Jul  5, 2001  11:05 AM      Fri, Jul 20, 2001   3:45 PM
  Sat, Aug  4, 2001   1:57 AM      Sat, Aug 18, 2001  10:56 PM
  Sun, Sep  2, 2001   5:44 PM      Mon, Sep 17, 2001   6:28 AM
  Tue, Oct  2, 2001   9:50 AM      Tue, Oct 16, 2001   3:24 PM
  Thu, Nov  1, 2001  12:43 AM      Thu, Nov 15, 2001   1:41 AM
  Fri, Nov 30, 2001   3:51 PM      Fri, Dec 14, 2001   3:49 PM
  Sun, Dec 30, 2001   5:42 AM      Sun, Jan 13, 2002   8:30 AM
  
                            2002
         Full Moon                              New Moon
  Mon, Jan 28, 2002   5:52 PM     Tue, Feb 12, 2002   2:42 AM
  Wed, Feb 27, 2002   4:18 AM     Wed, Mar 13, 2002   9:04 PM
  Thu, Mar 28, 2002   1:26 PM     Fri, Apr 12, 2002   3:23 PM
  Fri, Apr 26, 2002  11:01 PM     Sun, May 12, 2002   6:47 AM
  Sun, May 26, 2002   7:52 AM     Mon, Jun 10, 2002   7:48 PM
  Mon, Jun 24, 2002   5:43 PM     Wed, Jul 10, 2002   6:27 AM
  Wed, Jul 24, 2002   5:07 AM     Thu, Aug  8, 2002   3:15 PM
  Thu, Aug 22, 2002   6:29 PM     Fri, Sep  6, 2002  11:11 PM
  Sat, Sep 21, 2002  10:00 AM     Sun, Oct  6, 2002   7:18 AM
  Mon, Oct 21, 2002   3:21 AM     Mon, Nov  4, 2002   3:35 PM
  Tue, Nov 19, 2002   8:35 PM     Wed, Dec  4, 2002   2:36 AM
  Thu, Dec 19, 2002   2:12 PM     Thu, Jan  2, 2003   3:25 PM

                             2003
        Full Moon                              New Moon
  Sat, Jan 18, 2003   5:49 AM     Sat, Feb  1, 2003   5:50 AM
  Sun, Feb 16, 2003   6:53 PM     Sun, Mar  2, 2003   9:37 PM
  Tue, Mar 18, 2003   5:36 AM     Tue, Apr  1, 2003   2:20 PM
  Wed, Apr 16, 2003   3:37 PM     Thu, May  1, 2003   8:16 AM
  Thu, May 15, 2003  11:36 PM     Fri, May 31, 2003  12:20 AM
  Sat, Jun 14, 2003   7:16 AM     Sun, Jun 29, 2003   2:39 PM
  Sun, Jul 13, 2003   3:21 PM     Tue, Jul 29, 2003   2:53 AM
  Mon, Aug 12, 2003  12:48 AM     Wed, Aug 27, 2003   1:26 PM
  Wed, Sep 10, 2003  12:36 PM     Thu, Sep 25, 2003  11:09 PM
  Fri, Oct 10, 2003   3:28 AM     Sat, Oct 25, 2003   8:51 AM
  Sat, Nov  8, 2003   8:15 PM     Sun, Nov 23, 2003   6:00 PM
  Mon, Dec  8, 2003   3:38 PM     Tue, Dec 23, 2003   4:45 AM

                            2004
         Full Moon                              New Moon
  Wed, Jan  7, 2004  10:42 AM     Wed, Jan 21, 2004   4:07 PM
  Fri, Feb  6, 2004   3:49 AM     Fri, Feb 20, 2004   4:20 AM
  Sat, Mar  6, 2004   6:17 PM     Sat, Mar 20, 2004   5:44 PM
  Mon, Apr  5, 2004   7:05 AM     Mon, Apr 19, 2004   9:24 AM
  Tue, May  4, 2004   4:35 PM     Tue, May 19, 2004  12:54 AM
  Wed, Jun  3, 2004  12:21 AM     Thu, Jun 17, 2004   4:28 PM
  Fri, Jul  2, 2004   7:10 AM     Sat, Jul 17, 2004   7:24 AM
  Sat, Jul 31, 2004   2:06 PM     Sun, Aug 15, 2004   9:24 PM
  Sun, Aug 29, 2004  10:22 PM     Tue, Sep 14, 2004  10:28 AM
  Tue, Sep 28, 2004   9:09 AM     Wed, Oct 13, 2004  10:47 PM
  Wed, Oct 27, 2004  11:07 PM     Fri, Nov 12, 2004   9:26 AM
  Fri, Nov 26, 2004   3:07 PM     Sat, Dec 11, 2004   8:29 PM
  Sun, Dec 26, 2004  10:06 AM     Mon, Jan 10, 2005   7:04 AM

                            2005
         Full Moon                              New Moon
  Tue, Jan 25, 2005   5:33 AM     Tue, Feb  8, 2005   5:30 PM
  Wed, Feb 23, 2005  11:55 PM     Thu, Mar 10, 2005   4:13 AM
  Fri, Mar 25, 2005   4:00 PM     Fri, Apr  8, 2005   4:35 PM
  Sun, Apr 24, 2005   6:09 AM     Sun, May  8, 2005   4:48 AM
  Mon, May 23, 2005   4:21 PM     Mon, Jun  6, 2005   5:57 PM
  Tue, Jun 22, 2005  12:16 AM     Wed, Jul  6, 2005   8:04 AM
  Thu, Jul 21, 2005   7:02 AM     Thu, Aug  4, 2005  11:05 PM
  Fri, Aug 19, 2005   1:55 PM     Sat, Sep  3, 2005   2:45 PM
  Sat, Sep 17, 2005  10:01 PM     Mon, Oct  3, 2005   6:27 AM
  Mon, Oct 17, 2005   8:13 AM     Tue, Nov  1, 2005   8:23 PM
  Tue, Nov 15, 2005   7:57 PM     Thu, Dec  1, 2005  10:00 AM
  Thu, Dec 15, 2005  11:15 AM     Fri, Dec 30, 2005  10:11 PM

Surprise! The common definition of a blue moon is wrong!

Along with many others, I used to believe that a "blue moon" was a month with two full moons. However, research by Sky and Telescope shows that this was due to an error made by the magazine in 1946. The original definition is the third full moon in a season with four full moons (instead of the usual three).

For my part, I like the original definition better. It relates one astronomical event, a full moon, with another astronomical marker, the solstices and the equinoxes. The "new" definition uses an imposed time scheme, the Gregorian calendar, for its definition.

So from now on, I'm going by the old definition. If you prefer the newer definition, or you want to look for a "black moon" (the second new moon in a month)... well, you've got eyes and you've got a mind. Look for yourself in the table above. For either definition, consult this chart from Sky and Telescope for the dates of the blue moons for the next twenty years.


Recently, I've received several messages from visitors to this page asking various calendar questions (e.g., "How often are there blue moons?" or "When will there be a full moon on Halloween?"). I'm sorry, but I don't have time to be an astronomical calendar calculation service. However, you can find any number of freeware or shareware calendar programs on the net to answer such questions. Some resources are:

You can also do what I did and write your own programs. My sources for my astronomical calculations were:

These books give you all the bits and pieces of astronomical calculations, which you can fit together as you like. It's not any harder than, say, building a plastic model from a kit and then putting the model in your own diorama.

You probably already have the necessary tools on your computer. Even if you don't have a programming language like C, C++, BASIC, or FORTRAN on your machine, the calculations are well within the capabilities of any spreadsheet program. The web browser you're using probably supports Javascript or Java (arithmetic isn't their forte, but you can give it a shot).

Even if you have no additional software for your computer, you can still program them to perform arithmetic calcuations. On Macs you can use AppleScript, and I imagine something similar can be done with .COM files in Windows. (I used IGOR, because it was convenient at the time.)

So if you're looking for a project that will teach you the basics of programming, calendar calculations are a good way to start.


Copyright (c) 1999 by Bill Seligman with these exceptions
Table created 20-Dec-98
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