Bandwagon vs Big Dipper

Bandwagon

Big Dipper

name
  • A bright circumpolar asterism of the northern sky, said to resemble a ladle or cart. It is part of the constellation Ursa Major and includes the stars Mizar, Dubhe, and Alkaid. The other stars in it are Alioth, Megrez, Merak, and Phecda. 

How often have the words Bandwagon and Big Dipper occurred in a corpus of books? (source: Google Ngram Viewer )