Crossing: The Pleiades

The most globally entangled mythology-astronomy correspondence in human history.

Unlike the planetary crossings, the Pleiades crossing is not between a god and a wandering planet — it is between a cluster of nymphs and a cluster of stars, where the mythology and astronomy have been inseparable for at least 3,600 years and possibly 100,000.

The Core Correspondence

The pleiades-cluster is an open star cluster ~444 light-years away in Taurus. It contains over 1,000 stars; 6–7 are visible to the naked eye. The mythological Pleiades are seven daughters of Atlas, companions of Artemis, pursued eternally by Orion.

The crossing operates on multiple levels simultaneously:

The Number Seven — Every culture names seven sisters, even though only six are typically visible. The mythological explanation (the lost Pleiad) maps directly to the astronomical observation of a "missing" seventh. This may be genuine folk-astronomy — encoding a real astronomical puzzle in a memorable narrative.

The Pursuit — Orion (winter constellation) eternally pursues the Pleiades (associated with spring). This is astronomically real: when the Pleiades rise at dusk in autumn, Orion has set; when the Pleiades set in spring, Orion rises. The myth encodes the actual sky mechanics of a chase that has no resolution.

The Calendar — The Pleiades' heliacal rising marked the start of the Mediterranean sailing and planting season. Hesiod's *Works and Days* organises agricultural activity around their risings and settings. The myth of the sisters (*plein* = to sail) encodes practical astronomical knowledge as narrative.

The Genealogy — Maia, eldest of the Pleiades, is Hermes's mother. The mythological lineage connects the Pleiades directly to Hermes and the Mercury crossing — making the Pleiades the grandmother-cluster of the entire mythology × astronomy web we've built. Orion pursues them; Hermes is their grandchild.

The Lost Pleiad as Astronomy

Only six Pleiades are easily visible naked-eye. The universal myth of a missing seventh — found in Greek, Indigenous Australian, Japanese, and multiple other independent traditions — may encode an actual astronomical observation from ~100,000 years ago, when Pleione was separated from Atlas and genuinely visible as a seventh distinct star. If so, this is the oldest continuous astronomical tradition in human knowledge.

The Nebra Sky Disk

The Nebra sky disk (~1600 BC, Germany) shows seven dots alongside the Sun and Moon — the earliest known material depiction of the Pleiades, confirming the identification at least 3,600 years ago, long before Greek civilisation.

In Babylonian astronomy, MULMUL ("star star") heads the list of ecliptic stars — because in 2330 BC the Pleiades marked the vernal equinox. They were literally the starting point of the celestial calendar.

Crossing Type

observed — the most deeply, deliberately observed crossing in the set. The Pleiades' agricultural and navigational significance made precise tracking essential for survival. The mythology is not merely decorative; it is a mnemonic system for astronomical knowledge, encoding seasonal markers, the duration of Orion's retreat, the sailors' window, and the calendar's structure in a form that could be transmitted across thousands of years without writing.