The Janesville Academy was opened (the passage says "about January 1"); a 1908 biography likewise states that an academic school was established in Janesville in 1846.

The evidence

• “About January 1, 1846, the Janesville Academy was opened by Rev. Thomas J.”

  1908-brown-rock-county/26-history-of-janesville.md, Vol. 2, PDF p. 25 / book p. 539

  Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.

  Grade A: Found on a page of one of our sources