BEYOND STONEHENGE by GERALD HAWKINS 319 pages. Harper & Row. $10.
"If I were given one wish by a genie," writes Gerald Hawkins, "I would ask for a time machine to go back to dates like 1776, 1066 and 2000 B.C." But in a sense Hawkins has already had his wish—with the help of aerial surveys, radiocarbon dating and a computer. As a Boston University astronomer, he has been able to program the orbits of the sun and moon, then order a computer to trace them backward in time.
Thus he has "watched" ancient...