We analysed in the paper the possible purpose of the Great Cursus in the Stonehenge area.
We analysed the ephemeride of Sun and Moon and we found that the border lines of Great Cursus could help to determine the mutual position of all of three bodies – Earth, Moon and Sun, which repeats once per saros (app. 18 years). The moonrise in the beginning of saros, when the angle between Moon´s orbit and equator is the lowest, was in the direction of the Great Cursus during the first and last quarter of the Moon. Therefore, the people, who built the Stonehenge, could predict the solar or lunar eclipse 7 or 21 in advance.
The Stonehenge itself, which was built 500 years after Great Cursus, seems to be (from this point of view) only a „calculator“ of saros cycle, heritage place and superstructure of the Great Cursus.