A Calculus of Angels

Author	Gregory Keyes
Cover artist	Therese Nielsen
Language	English
Series	The Age of Unreason
Genre	Alternate history, fantasy
Publisher	Del Rey
Publication date	March 30, 1999
Publication place	United States
Media type	Print ( Paperback)
Pages	406
ISBN	978-0-345-40607-1
OCLC	39695456
Dewey Decimal	813/.54 21
LC Class	PS3561.E79 C35 1999
Preceded by	Newton's Cannon
Followed by	Empire of Unreason

A Calculus of Angels is an alternate history and fantasy novel by American writer Gregory Keyes, the second book in The Age of Unreason series. ^{[1] [2]} It was initially published by Del Rey on March 30, 1999. A follow-up to Newton's Cannon, the book is set in 1722 and continues the alternate history where Isaac Newton discovers that alchemy works, and a powerful science is built upon it.

• A Calculus of Angels title listing at the Internet Speculative Fiction Database

• "A Calculus of Angels (Book)." Publishers Weekly 246.12 (22 March 1999): 74.
• Green, Roland. "Adult books: Fiction." Booklist 95.16 (15 April 1999): 1518.
• Cassada, Jackie, and Barbara Hoffert. "Book Reviews: Fiction." Library Journal 124.7 (15 April 1999): 148.
• Vretos, Linda A., and Trevelyn E. Jones. "Adult/Young Adult: Fiction." School Library Journal 46.1 (January 2000): 156.

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