Astronomical Features
The four outer stones are oriented to mark the limits of the 18.6 year lunar declination cycle. The center column features a hole through which the North Star can be seen regardless of time, as well as a slot that is aligned with the Sun's solstices and equinoxes. A 7/8" aperture in the capstone allows a ray of sun to pass through at noon each day, shining a beam on the center stone indicating the day of the year.
Read more about this topic: Georgia Guidestones
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