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Dates of Some Early Blue Moons




Sky and Telescope Magazine


 

These Blue Moons are not listed in the Maine Farmersą Almanac from 1915 to 1951 but are identified as such in the "Farmers' Calendar" commentaries of the 1937 to 1948 editions.

These Blue Moons are listed explicitly in the "Aspects, Holydays, Weather, Etc." section of the Maine Farmers' Almanac from 1937 to 1956. (All dates in both columns are Universal Time.)

1915 November 21

1937 August 22

1918 August 22

1940 May 21

1921 May 21

1943 February 20

1924 February 20

1945 August 23**

1926 summer

1948 May 23

1929 spring

1951 May 21*

1932 winter*

1953 November 20

1934 November 21

1956 August 21

1951 winter*

 

*The "Farmers' Calendar" for May 1948 gave the seasons of several past and future Blue Moons, including winter of 1932 and winter of 1951, both of which are probably errors. When the 1951 almanac was actually printed, the Blue Moon was listed on May 21, 1951. Our calculations give Blue Moons on May 20, 1932, and May 21, 1951.

**Our calculations based on the apparent Sun give August 23, 1945, while computations based on the mean Sun give November 19, 1945. The August 1945 Blue Moon appears to be another almanac error.

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