amateur astronomy education: guides, charts and calculations

About these guides

These pages cover amateur astronomy education in practical terms — definitions, worked calculations, and the comparisons people actually look up rather than general overviews.

Educational reference material. Where rules change, the governing body is authoritative.

Heritage note: Continuity statement: This archive maintains previously edited reference entries for those researching scientific and historical topics. Presentation may be refreshed over time while the underlying facts are kept intact.

Highlighted archive entries

New reference pages are folded into this list during occasional updates.