Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1808 - 1855 1856 - 1890 1891 - 1897 1898 - 1978 1979 - 2008 auroras English
1808 - 1884 1885 - 1960 1961 - 1963 1964 - 1973 1974 - 2008 aurorae English

Run your own experiment! Raw data is available for download here.
© 2013 Google - Privacy & Terms - About Google - About Google Books - About Ngram Viewer