I originally posted this discussion a few years ago, focusing on the fascinating summer solstice sunrise alignment connecting America's Stonehenge (North Salem, NH) to Stonehenge England and then to the Phoenician homeland of Lebanon. I now want to update: It turns out that the alignment continues, as we theorized, to the ancient Phoenician homeland at a site located in the Golan Heights in what is now Israel. The site is called Israeli Stonehenge and is also known as Gilgal Refaim, the Wheel of the Giants. Its various "spokes" and "wheels," mark the celestial and astronomical events of the year. It is, like its namesakes, essentially, a stone calendar.
The mound in the center is fifteen feet tall, and the outer circle is over 500 feet in diameter. Incredibly, the site aligns to within 1/6 of 1 degree along the summer solstice sunrise line connecting America's Stonehenge to Stonehenge England. Not bad for sites separated by 6,000 miles!
I think what happened was that the ancient seafaring Phoenicians, being sun worshipers, built these ceremonial sites as they sailed westward to trade for tin (in southern England near Stonehenge) and copper (northern New England and Great Lakes regions), both of which were needed in vast quantities during the Bronze Age. The summer solstice was the most important day of the year to sun worshipers (being the sunniest), which is why the sites are aligned on the sunrise of that day. How did they do it? The same way they navigated the oceans: through their knowledge of astronomy.
[Original post reprinted below]