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.
It is one standard threshold for separating diffraction patterns.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.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
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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.
Rayleigh Criterion: fact and faith, kept distinct
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.
Rayleigh Criterion at work: an example
For a circular aperture the angle scales approximately as 1.22 wavelength divided by diameter.
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.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Also appears in
- Astronomy & Skywatching
- Aliases
- None listed
- Last updated
- 2026-07-16
Apply a resolution criterion
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More in Astronomy & Skywatching
Common questions
What is Rayleigh Criterion?
The Rayleigh Criterion conventionally resolves two point sources when one diffraction maximum falls on the other’s first minimum.
How is Rayleigh Criterion used in an almanac?
Treat it as a criterion, not an absolute biological boundary.
What should I avoid when interpreting Rayleigh Criterion?
Real detectors and image processing can use other definitions.
