5 months of dating
A draconic month is shorter than a sidereal month because the nodes move in the opposite direction as the Moon is orbiting the Earth, one revolution in 18.6 years.Therefore, the Moon returns to the same node slightly earlier than it returns to the same star.A synodic month is longer than a sidereal month because the Earth-Moon system is orbiting the Sun in the same direction as the Moon is orbiting the Earth.The Sun moves eastward with respect to the stars (as does the Moon) and it takes about 2.2 days longer for the Moon to return to the same apparent position with respect to the Sun.
Therefore, the beginning and lengths of months defined by observation cannot be accurately predicted.The ides occur on the thirteenth day in eight of the months, but in March, May, July, and October, they occur on the fifteenth.The nones always occur 8 days (one Roman week) before the ides, i.e., on the fifth or the seventh.This system has been used for hundreds of years and throughout many generations.This calendar is cyclical and relies on the position and shape of the moon.
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The knuckles of the four fingers of one's hand and the spaces between them can be used to remember the lengths of the months.