John Opsopaus PhD Books

Llewellyn'S 2024 Magical Almanac

By Llewellyn Worldwide, Sasha Graham, Tudorbeth, Mireille Blacke, LLEWELLYN, Chic Cicero, Suzanne Ress, Tisha Morris, Natalie Zaman, Kate Freuler, Mickie Mueller, Sandra Tabatha Cicero, Raechel Henderson, Stephanie Woodfield, Melissa Tipton, Elizabeth Barrette, Charlie Rainbow Wolf, J D Walker, Susan Pesznecker, Monica Crosson, Emma Kathryn, Blake Octavian Blair, Brandon Weston, Diana Rajchel, Danielle Blackwood, Olivia Graves, H. Byron Ballard, Lupa, Llewellyn Worldwide Ltd, John Opsopaus PhD

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For over three decades, this almanac has provided spells, rituals, and ideas that inspire practitioners of all levels to deepen their magical practice. You'll enjoy two dozen articles, grouped by e...

The Secret Texts Of Hellenic Polytheism: A Practical Guide To The Restored Pagan Religion Of George Gemistos Plethon

By John Opsopaus, John Opsopaus PhD

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The Oracles Of Apollo: Practical Ancient Greek Divination For Today

By John Opsopaus, John Opsopaus PhD, Opsopaus PhD, John

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Throughout history, divination has been an important tool for seeking guidance from the gods. Fortunately, several classical divination systems are available to us again today. The Oracles of Apoll...

Oracles of Apollo

By John Opsopaus

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.