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.
 | |
| 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 |
| 813/.54 21 | |
| LC Class | PS3561.E79 C35 1999 |
| Preceded by | Newton's Cannon |
| Followed by | Empire of Unreason |
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