In 1987, using ancient Mayan glyphs, Dr. Jose Arguelles created the Dreamspell calendar based on 13 Moons of 28 days. The calendar harmonizes with natural cycles of the sun, moon, earth and planets. It incorporates the 260 day count known as the Tzolk'in. The calendar has been used widely since the Harmonic Convergence August 16 - August 17, 1987.