Lunar Science

Beginner's Guide to Reading a Moon Map: Coordinates, Names, and Features

Beginner's Guide to Reading a Moon Map: Coordinates, Names, and Features

A practical walkthrough of lunar coordinates, IAU feature names, and the small orientation checks that make any moon map match what you actually see in the eyepiece.

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What Is a Supermoon? Separating Real Size Changes from Moon Illusion

What Is a Supermoon? Separating Real Size Changes from Moon Illusion

A supermoon is a full moon near perigee, only modestly larger than average. The dramatic horizon effect comes mostly from moon illusion, not a sudden change in size.

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Moon Phases Explained: Why the Moon Rises at Different Times Each Night

Moon Phases Explained: Why the Moon Rises at Different Times Each Night

The Moon's phase and its rise time are two faces of the same geometry. Here is how the angle between Sun and Moon sets your evening sky.

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