The word terrestrial has several meanings but in this menu, it pertains to the Earth as distinct from other celestial bodies.
Books
To see information about this book and where to buy: https://astronavigationdemystified.com/astro-navigation-demystified-2/
For information about this book and where to buy: https://astronavigationdemystified.com/applying-mathematics-to-astro-navigation-3/
For information about this book and where to buy: https://astronavigationdemystified.com/astronomy-for-astro-navigation-2/
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Astro Navigation Demystified 
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