The Big Dipper is the constellation that is called “great bear” or “big trolley” in German, or “the Plough” in English.
I cannot see why this block is named after this constellation. But I made the amazing discovery that it looks definitely different when set on point—much better, in fact! I saw examples of this block using three or even four different prints, thus carving out the center pinwheel much better than in this two-print version. But I still decided on two prints because I like the idea of seeing as much as possible in this block.
By the way, I did not paper piece this one. Instead, I measured the final length at the side of the quarter square triangle, added 1.25 inch to this and cut squares of this size. Out of two squares of a different print you get two quarter square triangle squares.