Star lore
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.
$0 today, then $12/month after 7 days. Cancel anytime.
At a glance
- Found in
- Constellations & Star Lore
- Related
- Draco, Equuleus, Fornax, Gemini Constellation
What does your own chart say about you?
Choose love, work or purpose. Your reading is written from your chart. Your reading uses your own birth details.
Walk through Alex’s whole example first
The Road of AgesSee the turning points of your whole life, from your birth date
See your road's shape
Prefer to explore first?
The Road of AgesThe turning points of your whole life, from your own chart
Walk my road
Free, by email
Your daily Almanac letter
One short letter at 7 each morning: the day’s theme read for your own chart, and one thing to do with it.
The story behind Eridanus
Eridanus was listed by Ptolemy; later southern mapping extended the river to the bright star Achernar.
A one-minute story
The Road of the Sun
Where the twelve signs came from, and why they carry the names they do.
Why Eridanus matters
Eridanus’s enormous north-to-south span gives observers a route across many declinations and a variety of galactic environments.
How to read Eridanus
Begin at Cursa near Rigel, follow the repeated bends southward, and finish at Achernar where visible.
Eridanus in practice: an example
Epsilon Eridani is a nearby Sun-like star found in the northern reaches of the constellation.
Where readings of Eridanus go wrong
Much of southern Eridanus, including Achernar, is unavailable from high northern latitudes.
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
- Last updated
- 2026-09-26
Follow the River from Orion to Achernar
A definition tells you what it is; your own birth chart tells you what it means for you. The Oracle casts your real chart and answers for your love, your work, and your year ahead, in conversation. It opens with the 7-day Seeker trial.
Speak with the OracleRelated terms
More in Constellations & Star Lore
From the reference page to your own chart
Every word here
is in your own chart.
- A personal reading about love, work or purpose, written from your chart
- A practical next step to consider
- It opens with 7 days free, with the AI Oracle and daily guidance
$0 today, then $12/month after 7 days. Cancel anytime.
Common questions
What is Eridanus?
Eridanus is a vast constellation representing a celestial river that flows south from Orion's neighborhood to Achernar.
What do people get wrong about Eridanus?
Much of southern Eridanus, including Achernar, is unavailable from high northern latitudes.
Free, by email
The Almanac, in your inbox at 7
One short letter at 7 each morning: the day’s theme read for your own chart, and one thing to do with it.
