According to Dr. Gerald Hawkins' theory, what might people gather to observe at Stonehenge?

According to Dr. Gerald Hawkins' theory, people would gather at Stonehenge to observe and predict the eclipses including the movement of the moon all year round and summer-solstice sun rising over the heel stone. The stone monoliths would have been used to compute the timing of the eclipses.

In the British Scientific Journal Nature, Dr. Hawkins wrote about Stonehenge in 1963.