Manhattanhenge (sometimes referred to as Manhattan Solstice) is a semi-annual occurrence in which the setting sun aligns with the east-west streets of Manhattan's main street grid. The term is derived from Stonehenge, at which the sun aligns with the stones on the solstices. It was coined in 2002 by Neil deGrasse Tyson, an astrophysicist at the American Museum of Natural History. It applies to those streets that follow the Commissioners' Plan of 1811 which laid out a grid offset 28.9 degrees from true east-west.

    At sunset, a traveler along one of the north-south avenues on the West Side while looking east can observe the phenomenon indirectly, being struck by the reflected light of the many windows which are aligned with the grid. An observer on the East Side can look west and see the Sun shining down a canyon-like street.     The dates of Manhattanhenge are usually May 28 and July 12 or July 13. The two corresponding mornings of sunrise right on the center lines of the Manhattan grid are approximately December 5 and January 8. As with the solstices and equinoxes, the dates vary somewhat from year to year.

                             .

     史前巨柱是英国最著名的史前建筑遗迹, 它的建造起因和方法至今在考古界仍是个不解之谜. 巨石阵也叫做圆形石林, 位于英国离伦敦大约120公里一个叫做埃姆斯伯里的地方. 那里的几十块巨石围成一个大圆圈，其中一些石块足有六米之高. 据估计, 圆形石林已经在这个一马平川的平原上矗立了几千年. 巨石阵又称索尔兹伯里石环、环状列石、太阳神庙、史前石桌、斯通亨治石栏、斯托肯立石圈等名, 是欧洲著名的史前时代文化神庙遗址. 位于英格兰威尔特郡索尔兹伯里平原, 考古碳年代鉴定技巧的结论是约建于西元前4000-2000年(第1期建造约是5100年前, 第2期建造约是5000年前)，属新石器时代末期至青铜时代.

                                                                      Salisbury Stonehenge (英国), 2200BC