Big Books of 2026

Join the Goodreads Author Program

Are you Jonathan Zwart, author of the book below?
Practical Astronomy with your Calculator by Peter Duffett-Smith


To join the author program as Jonathan Zwart, you will first need to sign in to Goodreads. Then navigate back to this page to apply.


About the Author Program
Authors on Goodreads
Author Guidelines
Author Program How-To
Author & Advertisers Blog
Ask the Author: Featured Authors
About Goodreads