Equinox Stone. Loughcrew Cairn T Megalithic Cairn at the Slieve na Caillaigh hills at Loughcrew, Ireland built around 3400 BC....

Equinox Stone. Loughcrew Cairn T Megalithic Cairn at the Slieve na Caillaigh hills at Loughcrew, Ireland built around 3400 BC. Traditionally described as a Passage Tomb, the wonderfully decorated backstone shows that the Cairn has a clear astronomical purpose. A beam of light from the rising sun around the time of the March & September equinoxes mapped on the backstone of the Cairn, lasting for 50 minutes.

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