Google Books Ngram Viewer

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

1800 - 1819 1820 - 1868 1869 - 1880 1881 - 1968 1969 - 2000 astronomy English
1800 - 1924 1925 - 1989 1990 - 1992 1993 - 1995 1996 - 2000 astrophysics English

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