Nabta Playa
Another stone megalithic structure exists which consists of a central radial stone and several other stones in the distance. In interpreting this Brophy found that the lines made to these stones from the radial stone match the spots in the sky where the various stars marked by the center stones in the calendar circle at the time they rose as the vernal equinox heliacal rising. In analyzing the varying distances, mulling through assumptions such as that they represented the brightness of the stars, he inadvertently found that they matched the distance of the stars from Earth on a scale of 1 meter = .799 light years within the margin of error for astronomical distances calculated today.