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Hello David,

Do you know anything about previous editions of this book?
Are there any differences except almanac data?

New edition's author: Kendall Carter (from 2020)

"The book continues to feature the well-received additions of the past few years, including forms to help determine True Altitude (for the sun, stars and planets), Calculated Altitude (using the versine formula) and Azimuth (using the ABC Tables), as well as a pro forma for calculating Intercept. With 8 extra pages and an improved layout, there is plenty of space for making notes and calculations."

Older editions: Andy Du Port
e.g 2017:
"This year the book has been expanded and now includes forms to help determine True Altitude (for the sun, planets and stars), Calculated Altitude (using the versine formula) and Azimuth (using the ABC Tables), as well as a pro forma for calculating Intercept. With 8 extra pages, the layout has been improved and there is now plenty of space for making notes and calculations."

Maybe there are bigger differences before 2017, but it doesn't seem to me that much has changed since then.
I like learning new methods, but 38 USD vs. 8 USD is a huge difference :-)

Thank you very much,
Bela