great year
Học thuậtThân thiện
Definition
Noun: - Great Year: A very long astronomical cycle defined as the time required for one complete cycle of the precession of the equinoxes. This cycle, also known as the Platonic Year, is approximately 25,800 years. It refers to the slow, gradual shift in the orientation of Earth's axis of rotation, which causes the position of the equinoxes to move westward along the ecliptic relative to the fixed stars.
Usage Examples
- Noun:
- Ancient astronomers were aware of the concept of a great year, linking it to cosmic cycles.
- The completion of a great year marks a full cycle of the Earth's axial precession.
Advanced Usage
- "the Great Year": Often capitalized when referring to the specific astronomical cycle.
- Plato discussed the concept of the Great Year in his dialogues.
Variants and Related Words
- Platonic Year (n): A synonym for "Great Year," named after the philosopher Plato who wrote about it.
- Precessional Cycle (n): A more technical term describing the same phenomenon.
- Axial Precession (n): The specific astronomical motion that causes the Great Year cycle.
Synonyms
- Platonic Year: The most common direct synonym.
- Equinoctial Cycle: A descriptive synonym focusing on the movement of the equinoxes.
Related Phrases
- Cycle of precession: A descriptive phrase for the Great Year.
- Astronomical cycle: A general term under which the Great Year is categorized.
Notes
This term is highly specialized and used primarily in astronomy, astrology, and discussions of ancient cosmology. It is not used in everyday conversation to describe a calendar year or a successful period of time.
Noun
- time required for one complete cycle of the precession of the equinoxes, about 25,800 years