地质年代在银河年中的周期规律

地质年代表中，从震旦纪至第三纪，各个纪之间的时间间隔并不是均匀相等的。根据天文学家观测到的银河系中心（银心）的赤道座标位置，确定出太阳系在银道面上的位置，把太阳系及地球绕银河系中心公转一周的时间确定为二亿二千万年。以目前太阳系在银道面上的位置为起点，按照时间倒退，顺时针逆转做图，确定过去不同地质年代太阳系在银道面上的位置。可以发现白垩、石炭、寒武、早震旦这四个纪，第三、二叠、奥陶这三个纪，三叠、志留、晚震旦这三个纪，侏罗、泥盆这二个纪各分别发生在银道面的同一位置。

THE PERIODIC REGULARITY OF GEOLOGICAL TIME IN THE GALACTIC YEAR

The geochronologic intervals between different periods from Sinian to Tirtiary period in chart of geochron are not homogeneous equal,the some of these are more than 60 Ma during the geohistorical evolution,and the other is only 40 Ma. The regularities of those geochron have been less studied by the former. According to the equatorial coodinate position of the galactic centre being observed by astronomist, it is determined that the position of solar system on galactic orbit plane, the time of the solar system and the earth revolution around the galactic centre for a circle, may be 220 Ma. If regarding the recent position of the solar system on the galactic orbit plane as beginning, drawing the sketch map to determine the positions of the solar system at different geoloical times on the galactic orbit plane, by reversing at clockwise according to the time moving back, it is found that the three groups of geoloical time, such as Cretaceous, Carboniferous, Cambrian and early Sinian periods, and Tirtiary, Permian and Ordovician periods, and Triassic, Silurian, later Sinian and Jurassic periods, may occur in the same position on the galactic orbit plane, respectivily.