Word origin · etymology
Editorial descriptive title.
Elemental refers to the named element classifications; cycle emphasizes recurrence; overlay uses the map-layer metaphor for adding classifications to a calendar.
How we know · epistemology
Editorial subject classification
“Elemental & cycle overlays” is a browsing category chosen for this atlas. Its child entries share a topic or practical connection. This grouping is not evidence that all of them descend from one historical lineage; transmission claims require separate sources.
Connected concepts
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These links connect subjects and terminology. They do not establish a shared historical origin.
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.