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lunation

lunation

9.9
The time from one new moon to the next, about 29 and a half days
  • noun
  • /luːˈneɪʃən/
  • Specialized
translation icon : lunación
  • The calendar is based on the lunar cycle, which consists of twelve lunations each year.
  • lunation is a month
  • only lunations

Examples

  • Clearly we do not see a constant magnitude of the Moon at the full phase; instead, we find a variety of full Moons, one for each lunation, or set of phases that repeats itself every 29.5 days.

    Academic text (2004)
  • A lunation lasts about 29.5 days from one New Moon to the next.

  • Understanding lunation helps astronomers track the Moon's phases accurately.

Synonyms

moon
vslunation
  • Specialized
61 3.7

A period of about 29 to 30 days used in some calendars

is the broader scientific term for the same time span
lunar month
vslunation
  • Specialized
1 3.6

About 29 and a half days from one new moon to the next

is the common name used for that interval rather than technical label
synodic month
vslunation
  • Specialized
9.3

The time between one new moon and the next, about 29.5 days

is the general term for the same periodic interval

Surface Forms

lunation singular
lunations plural

Morphology

lunation = lunar (semi-transparent) = lun + ation

The formation uses the Latin combining stem 'lun-' plus the productive English nominal suffix '-ation'; learners who know 'lunar' or the connection to the Moon will see the relation, but many learners know 'moon' rather than 'lun-', so the link is not fully transparent.

Etymology

Lunation comes from the Latin luna ('moon') and the ending -ation, which turns a word into a period or event, like the familiar word lunar. So a lunation is one full 'moon' cycle from new moon to new moon, about 29.5 days.