Alphabet, beth-luis-nion

The Beth-Luis-Nion alphabet of thirteen consonants was based on the ancient Lunar Calendar of thirteen twenty-eight day months, and followed the cycle of lunations. Each consonant was assigned a lunar month and given a numerical value. The Summer and Winter Solstices, and the Spring and Fall Equinoxes were important stations in the seasonal cycle, as were the "cross-quarter" days of Imbolc (also known as Candlemas), Beltane (May Eve), Lamas (the Feast of Set/the heliacal rising of Sirius, and beginning of the "dog days"), and Samhain (which is our All Hallows Eve).
In the wheel of the year, the principal stations of the Sun ~ the Solstices and the Equinoxes ~ marked the beginning of each season. Birth was marked at New Year's beginning by the Winter Solstice; growth was marked in Spring at the Equinox; maturity came in with  Summer at the Solstice; and decline was marked in Autumn by the Equinox.
Thirteen twenty-eight day months makes a year of 364 days with one day "left over"~ a year and a day ~ with the extra day upon the year representing the ending of the cycle, death, in Winter at the end of the now-old year, celebrated on the Eve of Winter Solstice and accorded special significance.
The five-pointed star, the Pentagram ~ a symbol of humanity ~ represents these five phases of human existence: birth, growth, maturity, decline, and death; and the five vowels, the most sacred of the letters, were assigned to the five cardinal stations of the sun as outlined above.Possibly the oldest values assigned to the Beth-Luis-Nion alphabet were of Apollonian origin, a period when the Irish had come very heavily under the influence of the Greeks.  If the order of the vowels even in antiquity followed the order in which we still learn to recite them as children, an idea with strong historic antecedents, then A -- E -- I -- O -- U, would have the corresponding values 1 -- 2 -- 3 -- 4 -- 5. The 13 original consonants would then follow the seasonal cycle of the alphabet of trees, with each assigned its corresponding lunar month, while the remaining 6 consonants, much later additions to our alphabet, will be assigned values upon similar magick, philosophic, philologic and historic lines.englishqabalah.com