Definition

Noun: - Synodic month: The period of time between two successive new moons, averaging approximately 29.531 days. This cycle is based on the Moon's phases as observed from Earth, marking the return to the same alignment of the Sun, Earth, and Moon.

Usage

The term is used in astronomy and calendrical contexts to describe the most familiar lunar cycle, which governs the appearance of the Moon's phases. - The traditional lunar calendar is based on the length of a synodic month. - A synodic month is longer than the Moon's orbital period because the Earth is also moving around the Sun.

Advanced Usage

• "the synodic month": Often used with the definite article when referring to the concept as a standard unit of time.
  • The difference between the sidereal and the synodic month is due to the Earth's revolution.

Variants and Related Words

• Lunation: A precise synonym for a synodic month.
• Lunar month: A common, less technical term that often refers to the synodic month.
• Synodic period: A broader term for the interval between successive conjunctions of any two celestial bodies, with the Sun and Earth as common reference points.

Synonyms

• Lunation
• Lunar month

Related Terms (Not Phrasal Verbs or Idioms)

• Sidereal month: The period of the Moon's orbit relative to the distant stars (about 27.3 days), distinct from the synodic month.
• New moon: The phase that marks the beginning and end of a synodic month.

Noun

1. the period between successive new moons (29.531 days)