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Astronomical Phenomenon Prediction
Planet Opposition & Conjunction Predictor
Upcoming oppositions, conjunctions and elongations of the planets.
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- Mercury at greatest western elongation2026-01-11
- Venus at greatest eastern elongation2026-03-24
- Mars conjunction with Jupiter2026-06-30
- Saturn at opposition2026-09-04
- Jupiter at opposition2026-11-20
- Uranus at opposition2026-12-15
Tool principle
Events derived from published planetary ephemerides (JPL DE440) and mean orbital synodic periods.
Data source: JPL Horizons published event tables (public).
User guide
- 1Oppositions are the best time to observe outer planets — largest, brightest, visible all night.
- 2Conjunctions bring two objects within a few degrees on the sky.
Frequently asked questions
What is elongation?＋
The angular distance between the Sun and an inner planet — greatest elongation is the best evening or morning viewing window.