A Calculus of Angels
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| Author | Gregory Keyes |
|---|---|
| Cover Artist | Therese Nielsen |
| Country | United States |
| Language | English |
| Series | The Age of Unreason |
| Genre(s) | Fantasy |
| Publisher | Del Rey |
| Released | March 30, 1999 |
| Media Type | Print (Paperback) |
| Pages | 406 pages |
| ISBN | ISBN 0-345-42607-9 |
| Preceded by | Newton's Cannon |
| Followed by | Empire of Unreason |
A Calculus of Angels is the second book in Gregory Keyes' The Age of Unreason series. 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.
