other authors propose a later composition. santanu chakraverti writes that it has been composed after 700 bce, while michael witzel dates it to the last centuries bce, based on the style of composing. according to chakraverti, its description of the winter solstice is correct for ca. 1400 bce, but not for the time of its composition after 700 bce. this may be due to the incorporation of late harappan astronomical knowledge into the vedic fold, an idea which is also proposed by subbarayappa. michael witzel notes: