This is book six of the Baroque Cycle, following on from Quicksilver, King of the Vagabonds, Odalisque, Bonanza, and The Juncto (the last two of which are referred to as The Confusion when read together as a single volume).
I’m glad that I accidentally read Longitude before this book, as in this work Daniel is a proponent of the lunar distance method, which was one of the main contenders to win the Longitude Prize. Lord Ravenscar proposed the prize in the book, which is a nice plot element. He of course wants to win the prize as well.
This book is much faster moving than most of the previous (except perhaps for King of the Vagabonds and Bonanza). Its a good read, and I can see how all of the previous setup is starting to pay off.