Sky science
Planetary Transit
Direct answer
Planetary Transit: A Planetary Transit occurs when a planet passes across the apparent disk of its star from an observer’s line of sight.
It is a silhouette crossing a stellar disk.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Inferior Conjunction, Superior Conjunction, Transit of Mercury, Transit of Venus
It is a silhouette crossing a stellar disk.
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The story behind Planetary Transit
Transits of Venus aided astronomical distance work; exoplanet surveys later generalized the method.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Planetary Transit matters
Transits reveal orbital geometry and can measure planet size or atmospheric signatures.
How to read Planetary Transit
exact contact times and safe equipment speaks to any solar transit.
Planetary Transit in practice: an example
A transit produces a small, time-shaped decrease in a star’s measured brightness.
Where readings of Planetary Transit go wrong
Alignment must include orbital latitude; conjunction alone is insufficient.
Sources and editorial method
Research references used for this entry include:
- NASA Science: What’s a Transit? - NASA explanation of planetary transits, light curves, and what transit measurements reveal.
- NASA Science: Eclipse Viewing Safety - Official solar-viewing guidance for eyes, cameras, binoculars, and telescopes.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Understand the transit method
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Common questions
What is a Planetary Transit?
A Planetary Transit occurs when a planet passes across the apparent disk of its star from an observer’s line of sight.
What do people get wrong about a Planetary Transit?
Alignment must include orbital latitude; conjunction alone is insufficient.
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