They also mark Imbolc, the ancient date for the beginning of Spring on February 1, Beltane, or May Day, \u00a0lammas, the start of the wheat harvest and Samhain, October 31 which traditionally marked the time when cattle were brought down from summer pastures and slaughtered for the winter which has become Halloween.<\/p>\n Contributor and editor John Matineau, said: \u201cPeople often think of our ancestors as rough cavemen but they were also sophisticated astronomers.<\/p>\n \u201cThey were applying Pythagorean geometry over 2000 years before Pythagoras was born.<\/p>\n \u201cWe see triangles and double squares used which are simple versions of pythagorean geometry. And then we have this synthesis on different sites of solar and lunar numbers.<\/p>\n \u201cWe think these people didn\u2019t have scientific minds but first and foremost they were astronomers and cosmologists. They were studying long and difficult to understand cycles and they knew about these when they started planning sites like Stonehenge.<\/p>\n \u201cI do feel very sad that visitors to Stonehenge are not told anything about the astronomical alignments, even when they are very simple to explain.\u201d<\/p>\n Nearly two miles north-east of\u00a0Stonehenge<\/a>, stood Woodhenge, which was…<\/p>\n<\/div>\n![\"A](\"http:\/\/redice.tv\/a\/i\/c\/18\/06\/stonehenge-triangles2.jpg\"\/)