ancient skywatchers regulated their calendars and tracked days with celestial alignments, often sunrises and sunsets with targetted shadow and light features on equinoxes, solstices and cross quarters
First a meteor exploded over Russia, followed closely by an asteroid fly-by. Now, two comets are expected to put on a naked-eye spectacle for skywatchers.
Old News documentary features enigmatic rock art from southeastern Colorado and the Oklahoma panhandle suggestive of a Celtic presence 1500 to perhaps 3000 years ago, particularly 8 August 471 CE