Astronomical Orientations of Bora Ceremonial Grounds in Southeast Australia

TL;DR

This study investigates whether bora ceremonial grounds in southeast Australia are deliberately aligned with the Milky Way's position in August, finding a significant preference for south and southwest orientations that support the Sky Bora hypothesis.

Contribution

It provides empirical archaeological evidence linking bora ground orientations to the Milky Way's position, supporting ethnographic interpretations.

Findings

Bora grounds show a preferred orientation to the south and southwest.

Statistical analysis confirms these orientations are deliberate, not by chance.

Supports the ethnographic link between bora sites and the Sky Bora in the Milky Way.

Abstract

Ethnographic evidence indicates that bora (initiation) ceremonial sites in southeast Australia, which typically comprise a pair of circles connected by a pathway, are symbolically reflected in the Milky Way as the 'Sky Bora'. This evidence also indicates that the position of the Sky Bora signifies the time of the year when initiation ceremonies are held. We use archaeological data to test the hypothesis that southeast Australian bora grounds have a preferred orientation to the position of the Milky Way in the night sky in August, when the plane of the galaxy from Crux to Sagittarius is roughly vertical in the evening sky to the south-southwest. We accomplish this by measuring the orientations of 68 bora grounds using a combination of data from the archaeological literature and site cards in the New South Wales Aboriginal Heritage Information Management System database. We find that bora grounds have a preferred orientation to the south and southwest, consistent with the Sky Bora hypothesis. Monte Carlo statistics show that these preferences were not the result of chance alignments, but were deliberate.