By, Looking at the rocks and its different patterns to see where the stars or planets are located and you can probably use its different patterns as a compass.
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Some scientists believe that Stonehenge is thought to be a primitive form of observatory. It could have been used to show the relationship between the stars and the planets. Others believe that it was warning to others not to come to that part of the island.
the movements of the Sun, Moon, planets and stars.
Astronomy, the study of the stars and planets and their movements.
No, there are circular movements just about anywhere: planets, moons and stars rotating, planets orbiting their stars, moons orbiting their planets, and stars orbiting their galaxies, often in orbits that are fairly circular, etc.
Stonehenge was used to track the stars and, therefore, could be also identify the time of year it was.
An extremely accurate calendar
The knowledge was central to their religion.
an extremely accurate calendar.
Orbit. The same goes for planets & other stars too.
well for starters, stars don't orbit planets. Planets orbit stars, but some stars don't have planets that orbit them.