Since the dawn of times, mankind has been using the sun and stars as a way to seek guidance and temporal reading. By watching the sun, mankind noticed that objects gained shadows, thus noticing that along the day the size and guidance of those shapes would vary. Primarily the primitive man used his own shadow to estimate hours. Then he saw that by placing a rod on the ground vertically he could make the same measurements. At dawn the shadow will be at its maximum length, at noon at its shortest and at dusk back to its maximum.
Close to the natural entrance of the cave we have one of these Solar Clocks with 4 meter diameter dully built by calculating the caves latitude, longitude and real North direction. For a better understanding of this clock, there’s a panel explaining the Time Equation and one can read the summer, winter and solar hour.
