Word origin · etymology
Greek and Latin through French; modern technical label.
Base means a foundation or supporting part. Human Design uses this foundational metaphor for a finer subdivision below Tone.
How we know · epistemology
Fine angular subdivision
Each tone is divided into five bases, yielding very small longitude intervals. A stable assignment requires adequate time and ephemeris precision; extra displayed detail does not independently support the corresponding spiritual interpretation.
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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.