Brian Warner Books

High Speed Astronomical Photometry

By Brian Warner

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Cataclysmic Variable Stars

By Brian Warner

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Cataclysmic Variable Stars Cambridge Astrophysics

By Brian Warner

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Royal Observatory Cape of Good Hope 1820 1831

By Brian Warner

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This volume presents a comprehensive account of the origin, construction and use of the first major astronomical observatory in the southern hemisphere. Technical aspects, such as the instruments a...

Astronomers at the Royal Observatory, Cape of Good Hope

By Brian Warner

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Charles Piazzi Smyth

By Brian Warner

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Variable Stars and Galaxies

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Flora Herscheliana

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Flora Herscheliana

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Practical guide to lightcurve photometry and analysis

By Brian D. Warner

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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.