# Check a fact before using it

These direct primary pages were read for the narrow meanings below on 9 October 2026. Our explanations and diagrams are original SubjectNest work. Provider links are references, not a grant to copy their media or proof of local visibility.

- [Moon phases](https://science.nasa.gov/moon/moon-phases/): Moonlight is reflected sunlight; the visible lit part changes, with a cycle of about a month. The Moon can be visible in daytime. A sparse fictional strip is not an exact cycle measurement or Australian orientation chart.
- [Earth facts](https://science.nasa.gov/earth/facts/): turning/day and orbit/about-year are different motions. These paper jobs do not measure those durations. Exact sidereal/calendrical figures and simplified leap rules are not taught here.
- [Reference systems](https://science.nasa.gov/learn/basics-of-space-flight/chapter2-2/): Earth rotation changes the ground view; a reference has a particular purpose. This bank does not teach telescope coordinates or a real constellation path.
- [ARPANSA Sun/eclipses](https://www.arpansa.gov.au/understanding-radiation/radiation-sources/more-radiation-sources/solar-eclipse): direct Sun viewing and optical aids can damage eyes. No Sun-viewing or eclipse experiment belongs to these lessons.

## Make it relevant locally

Choose a real question, then ask a grown-up to [review the current source and local context](LOCAL-REVIEW.html). Use exact source/title/version/update/check dates, timezone, reference, units, identity and limits. A prediction is not a sighting; a missing record is not proof nobody tried. Keep child/private location data out of generic teaching examples. Any wanted actual viewing is a separate adult decision; the complete indoor notes remain available.

[Sources and reuse](SOURCE-NOTICE.html) · [Curriculum](teacher/CURRICULUM.html) · [Return to choices](README.html)