Houses of the Gods

29 circles and crescents are carved around the long wavy line in the middle of the stone. Counting clockwise, the new moon is the first crescent to emerge from the spiral. Crescents become circles through the moon’s waxing phase until it reaches full moon - the circle at the top of the stone. Circles become crescents again through the moon’s waning phase. The nights of dark moon (the three nights of the month when the moon is not visible) are represented by the three crescents in the spiral. The new moon emerges from the spiral and the monthly cycle is repeated.

Calendar Stone, Knowth


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