Word origin · etymology
Middle English through French and Medieval Latin.
Lunation is traced through Middle English lunacioun and French forms to Medieval Latin lunatio, built on Latin luna, moon.
How we know · epistemology
Astronomical cycle and calendar model
An observed lunar cycle and a traditional computational month are related concepts, not automatically identical numerical objects. Phugpa month arithmetic uses the constants and correction rules of its specified model.
Merriam-Webster · lunation, definition and word history ↗Svante Janson · Tibetan calendar mathematics ↗
Connected concepts
Terms used in this explanation
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.