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Loughcrew Cairns is a megalith in Ireland, Europe. Office of Public Works, Ireland dates it to c. 3300 BCE. Office of Public Works, Ireland also records: “Equinox sunrise illuminates the backstone of Cairn T.”
Hilltop cairns where the equinox sunrise lights carved stones in Cairn T.



Guide answers and timeline insights related to this Wonder.
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Compare the published evidence and its interpretations. “Consensus” records the mainstream account; “Alternative” identifies a competing interpretation, not an equally established conclusion. Estimates and unresolved questions remain qualified in the claim text.
| Field | Consensus | Alternative |
|---|---|---|
| Date | 3300 BCE - 3000 BCE c. 3300 BCE Office of Public Works, Ireland | No claims found. |
| Purpose | Passage tombs Office of Public Works, Ireland | No claims found. |
| Method | No claims found. | No claims found. |
Equinox sunrise illuminates the backstone of Cairn T
Calculating elapsed time...
Approximate - counted from January 1, 3,150 BCE (UTC). Based on the midpoint of 3,300 BCE - 3,000 BCE; the underlying date is uncertain.
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|---|---|
| Centuries | — |
| Decades | — |
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Each row is an independent total of the same span, not a breakdown to add together.