Dictionary term
Eridanus
Direct answer
Eridanus is a vast constellation representing a celestial river that flows south from Orion's neighborhood to Achernar.
Eridanus is the River, a long winding constellation ending at bright Achernar.
Eridanus is the River, a long winding constellation ending at bright Achernar.
A symbolic locator, not a substitute for an observational chart at a specific place and time.Quick reference
- Use when
- Begin at Cursa near Rigel, follow the repeated bends southward, and finish at Achernar where visible.
- Do not use it for
- Much of southern Eridanus, including Achernar, is unavailable from high northern latitudes.
- Reference category
- Constellations & Star Lore
- Related terms
- Draco, Equuleus, Fornax, Gemini Constellation
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The story behind Eridanus
Eridanus was listed by Ptolemy; later southern mapping extended the river to the bright star Achernar.
Eridanus in spiritual tradition
Eridanus invites the eye to travel rather than capture the constellation in one glance.
Eridanus: fact and faith, kept distinct
This is a factual sky reference. It can support wonder and orientation without turning a measured position or inherited pattern into a claim of fate or private revelation.
Eridanus in numerology
Eridanus 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 Eridanus matters
Its enormous north-to-south span gives observers a route across many declinations and a variety of galactic environments.
Eridanus at work: an example
Epsilon Eridani is a nearby Sun-like star found in the northern reaches of the constellation.
Where interpretation stops
Eridanus 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:
- International Astronomical Union: The Constellations - Official names, abbreviations, and boundaries for the 88 modern constellations.
- NASA Space Place: What Are Constellations? - NASA introduction to constellation regions, patterns, visibility, and seasonal sky changes.
- Source
- The Great Almanac Dictionary
- Category
- Constellations & Star Lore
- Also appears in
- Constellations & Star Lore
- Aliases
- None listed
- Last updated
- 2026-07-16
Follow the River from Orion to Achernar
Eridanus in a book is one thing; Eridanus in your own birth chart is your life. The Oracle casts your real chart and tells you what it means for your love, your work, and your year ahead, in conversation, free.
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More in Constellations & Star Lore
Common questions
What is Eridanus?
Eridanus is a vast constellation representing a celestial river that flows south from Orion's neighborhood to Achernar.
How is Eridanus used in an almanac?
Begin at Cursa near Rigel, follow the repeated bends southward, and finish at Achernar where visible.
What should I avoid when interpreting Eridanus?
Much of southern Eridanus, including Achernar, is unavailable from high northern latitudes.
