Clive Ruggles Books

Astronomy in Prehistoric Britain and Ireland

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"Do prehistoric stone monuments in Britain and Ireland incorporate deliberate astronomical alignments, and if so, what is their purpose and meaning? Here, for the first time this topic, a subject o...

Astronomy Cosmology and Landscape

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Ancient astronomy

By C. L. N. Ruggles

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Ancient Astronomy

By C. L. N. Ruggles

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Heiau Aina Lani

By Patrick Vinton Kirch, C. L. N. Ruggles

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Heiau 256 ina Lani

By Patrick Vinton Kirch, C. L. N. Ruggles

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Skywatching in the Ancient World

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Na Inoa Hoku

By John Kaipo Mahelona, C. L. N. Ruggles, Rubellite Kawena Johnson

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Ancient Astronomy

By Clive Ruggles

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Stonehenge

By Clive Ruggles, Amanda Chadburn

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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.