Robert Hand Books

This is a translation of one of the earliest extant texts for horary astrology. Masha'allah ibn Athari (c. 740–815 AD) was an eighth-century Persian Jewish astrologer, astronomer, and mathematician...

Los Simbolos del Horoscopo

By Robert Hand

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Essays on Astrology

By Robert Hand

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Masha Allah On Reception

By Robert Hand

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Saturn

By Robert Hand, Liz Greene

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Saturn

By Robert Hand, Liz Greene, Juliana McCarthy

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Saturn

By Robert Hand, Liz Greene

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Saturn

By Robert Hand, Liz Greene, Juliana McCarthy

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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.