Dictionary term
Stellar Parallax
Direct answer
Stellar Parallax is the apparent annual shift of a nearby star against distant background objects as Earth changes orbital position.
It is an annual geometric distance signal.
It is an annual geometric distance signal.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.Quick reference
- Use when
- Use the parallax uncertainty; small measured angles can have asymmetric distance errors.
- Do not use it for
- Do not confuse parallax with proper motion or annual aberration.
- Reference category
- Astronomy & Skywatching
- Related terms
- Astronomical Nutation, Annual Aberration, Proper Motion, Radial Velocity
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The story behind Stellar Parallax
The first reliable stellar parallaxes were measured in the nineteenth century.
Stellar Parallax: 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.
Stellar Parallax in numerology
Stellar Parallax 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 Stellar Parallax matters
It provides a direct rung of the astronomical distance ladder.
Stellar Parallax at work: an example
A parallax of one arcsecond corresponds to a distance of one parsec.
Where interpretation stops
Stellar Parallax 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:
- U.S. Naval Observatory: Astronomical Almanac Glossary - Definitions for astronomical coordinates, time, reference systems, and observable phenomena.
- NASA Science: Stars - NASA overview of stellar birth, main-sequence evolution, giant phases, remnants, and supernovae.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Also appears in
- Astronomy & Skywatching
- Aliases
- None listed
- Last updated
- 2026-07-16
Measure distance through Earth’s orbit
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More in Astronomy & Skywatching
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Common questions
What is Stellar Parallax?
Stellar Parallax is the apparent annual shift of a nearby star against distant background objects as Earth changes orbital position.
How is Stellar Parallax used in an almanac?
Use the parallax uncertainty; small measured angles can have asymmetric distance errors.
What should I avoid when interpreting Stellar Parallax?
Do not confuse parallax with proper motion or annual aberration.
