Graham Dolan Books

The Greenwich guide to day and night
The Greenwich guide to day and night

By Graham Dolan

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Day and night - Sun - Day and night in different places - Shadows - Time zones - am and pm - Sky at night - Seasonal stars - Our Moon - Moon phases - Eclipses.

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The Greenwich guide to measuring time
The Greenwich guide to measuring time

By Graham Dolan

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What is time? - Patterns in time - Hours and minutes - Calendars - Names of the months - Day names - Timers - First clocks - Today's clocks and watches - Astronomers and timekeeping - What's the ti...

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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.

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