The researchers examined some of the oldest great stone circles built in Scotland such as Callanish, on the Isle of Lewis, and Stenness, Isle of Orkney ─ both predating Stonehenge's standing stones by about 500 years. They found that at 50% of the sites, the northern horizon is relatively higher and closer than the southern and the summer solstice Sun rises out of the highest peak in the north. At the other 50% of sites, the southern horizon is higher and closer than the northern, with the winter solstice Sun rising out of these highest horizons. The ancients erected these huge stones very precisely within the landscape and in relation to the astronomy they knew. What technology they used is still not understood by mainstream science.
Those who created the megaliths chose surroundings that would have influenced the way the Sun and Moon were seen. They were able to depict the special time when the Moon appears at its most northerly position on the horizon, which only happens every 18.6 years and took place when the stone monuments were made. The publication by Dr. Higginbottom and her team confirmed that the ancient Britons connected the Earth to the Sun and Moon with their earliest standing stones, and that this practice continued in the same way for 2,000 years.
Source reference: Ancient Origins
Credit for Image at top f page: The Callanish standing stones on the Isle of Lewis. (Colin Macdonald/CC BY 2.0)