Dictionary term
Rayleigh Criterion
Direct answer
Rayleigh Criterion: The Rayleigh Criterion conventionally resolves two point sources when one diffraction maximum falls on the other’s first minimum.
It is one standard threshold for separating diffraction patterns.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Also appears in
- Astronomy & Skywatching
- Aliases
- None listed
- Last updated
- 2026-07-16
Quick reference
- Use when
- Treat it as a criterion, not an absolute biological boundary.
- Do not use it for
- Real detectors and image processing can use other definitions.
- Reference category
- Astronomy & Skywatching
- Related terms
- Resolving Power, Diffraction Limit, Telescope Aperture, Telescope Focal Length
The story behind Rayleigh Criterion
Lord Rayleigh formalized resolution criteria within nineteenth-century wave optics.
Rayleigh Criterion in spiritual tradition
Conventions help compare gradual transitions without pretending they are walls.
The Great Almanac frames Rayleigh Criterion with educational restraint. Mystical or symbolic language may be meaningful, but it should not be exaggerated into certainty, panic, or permission to ignore ordinary responsibility.
Rayleigh Criterion in the Bible
This is a factual astronomy reference. It can support wonder at the created order without becoming a claim of fate, worship, or private revelation.
Rayleigh Criterion in numerology
Rayleigh Criterion is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Rayleigh Criterion matters
It turns a gradual visibility problem into a useful numerical comparison.
Example in a reading: For a circular aperture the angle scales approximately as 1.22 wavelength divided by diameter.
Interpretive caution: Real detectors and image processing can use other definitions.
How Rayleigh Criterion is used in a reading
Treat it as a criterion, not an absolute biological boundary.
Where interpretation stops
Rayleigh Criterion is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
Sources and editorial method
Research references used for this entry include:
- European Southern Observatory: Technology for Telescopes - Observatory reference for aperture, angular resolution, atmospheric seeing, mirrors, and telescope technology.
- NASA Science: Universe Glossary - NASA definitions for common stellar, galactic, orbital, and high-energy astronomy terms.
The page starts with a direct definition, then separates use, example, caution, spiritual meaning, and historical context. For astrology, occult, demonology, curse, and spiritual warfare terms, the editorial rule is to explain the term without making fear-based, fatalistic, medical, legal, financial, or ritual-instruction claims.
Continue learning
Continue from the definition into current sky positions, space weather, and the live collective celestial view.
Open Worldwide WatchRelated terms
These related entries help place Rayleigh Criterion inside a wider reference cluster instead of leaving it as a standalone keyword.
