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Read. Make a prediction. Come back to what you haven’t quite got yet.

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The Moon in plain sight

About this notebook

Why can half a Moon be called a quarter? Try six short questions, explain your reasoning, then compare it with the notes. This is self-practice, not an exam or an automatic grade.

Download a working file to keep your notes and responses.

6 questions to try

Make a predictionNot tried

A friend says: “It is first quarter, so only a quarter of the Moon’s visible disk is bright.” What would you correct?

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The working file contains your notes, responses, self-ratings and earlier versions. Nothing is automatically saved. Your entries stay in this tab; this site does not receive them.

Continue where you left off

Open a working JSON file you downloaded here. Your response history and self-ratings come with it.

Revise this notebook

Import updated study material with the same notebook and question IDs. Changed questions need another try; earlier responses stay in history.

Learn something else

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JSON files only, up to 8 MB. Up to 200 questions and 80 short notes. Study-material imports use notes and questions only; to retain a file’s existing responses, use Reopen working file.