Dictionary term
Magnification
Direct answer
Magnification is the ratio by which an optical system enlarges a target’s apparent angular size.
It makes an angular image appear larger.
It makes an angular image appear larger.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.Quick reference
- Use when
- Calculate telescope focal length divided by eyepiece focal length.
- Do not use it for
- Excess magnification enlarges blur and dims the exit pupil without creating detail.
- Reference category
- Astronomy & Skywatching
- Related terms
- Telescope Focal Length, Focal Ratio, Exit Pupil, True Field of View
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The story behind Magnification
Interchangeable eyepieces made variable telescope magnification practical.
Magnification: 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.
Magnification in numerology
Magnification 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 Magnification matters
It can reveal available detail when matched to aperture, seeing, and observer vision.
Magnification at work: an example
A 1200-millimeter telescope and 20-millimeter eyepiece produce 60 power.
Where interpretation stops
Magnification 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:
- NASA Science: Skywatching FAQ - NASA guidance for observing stars, planets, constellations, and changing sky events.
- European Southern Observatory: Technology for Telescopes - Observatory reference for aperture, angular resolution, atmospheric seeing, mirrors, and telescope technology.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Also appears in
- Astronomy & Skywatching
- Aliases
- None listed
- Last updated
- 2026-07-16
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Common questions
What is Magnification?
Magnification is the ratio by which an optical system enlarges a target’s apparent angular size.
How is Magnification used in an almanac?
Calculate telescope focal length divided by eyepiece focal length.
What should I avoid when interpreting Magnification?
Excess magnification enlarges blur and dims the exit pupil without creating detail.
