Blog 8: Astronomical Alignments in Southeast Asia and New Zealand: Evidence of Recognising Celestial Events
Updated: Jun 30
JOURNEY 1 - SERIES 5 - BLOG 8 - A PART OF 9 BLOGS IN SERIES 5 - Reading time: 4 Mins 15 Secs
Across the Asia–Pacific, communities developed ways to anticipate seasonal change by observing the sun’s annual path along the horizon. This article highlights evidence from Southeast Asia and New Zealand that people intentionally recognised recurring celestial events—especially solstices and equinoxes—where built features (temples, marker stones, and sightlines to prominent landscape points) repeatedly correspond with sunrise or sunset positions on key dates.
This discussion adds another dimension to New Zealand’s origin story. These migration patterns contribute to broader debates surrounding Southeast Asian migration to New Zealand and are frequently compared with established interpretations of Polynesian migration to New Zealand. Together, these competing perspectives continue to shape ongoing discussions about New Zealand’s first settlers.
Archaeoastronomy focuses on how past societies observed the sky and embedded that knowledge in material culture. Evidence is strongest when (1) alignments are measurable and repeatable, (2) they target astronomically significant dates (e.g., solstices/equinoxes), (3) multiple features at a site or across a region show consistent patterning, and (4) those patterns plausibly relate to documented social needs such as calendrical regulation, agriculture, navigation, or ritual timing.
Solstices occur when the sun reaches its most northerly or southerly rising and setting points on the horizon, producing the year’s longest and shortest days. Equinoxes occur when the sun crosses the celestial equator and day and night are approximately equal in length. Because these dates recur predictably, horizon observations of sunrise or sunset can function as practical seasonal markers.
Southeast Asia: temple orientation and solar observations
In mainland Southeast Asia, Hindu-Buddhist cosmology and Sanskrit astronomical traditions informed elite architecture, especially from the early second millennium CE onward. At Angkor, Khmer architects expressed cosmological ideas—such as the centrality of Mount Meru—through temple mountains, axial causeways, and carefully controlled sightlines. When principal axes and viewing points also coincide with notable sunrise positions, they provide material evidence that solar observation contributed to how monuments were designed, experienced, based on the calendar.
A frequently cited example is Angkor Wat, where observers at key viewpoints on the western approach can see the sun rise in close alignment with the central towers around the equinoxes (approximately 20–21 March and 22–23 September). Researchers have also proposed additional solar, lunar, or stellar references within the wider Angkor landscape, though these interpretations vary in strength depending on the measurement method and viewing location.
New Zealand: horizon markers, seasonal timing, and Māori astronomy
In New Zealand, astronomical knowledge is well attested in Māori traditions, including the use of prominent stars and star clusters for seasonal timing and ceremony (for example, the heliacal rising of Matariki). Physical evidence for deliberate solar observation can also be investigated where earthworks, stone features, or repeated sightlines appear to target consistent sunrise or sunset points on the horizon at key times of year. As with Southeast Asian temple studies, the strength of any claim depends on whether alignments are clearly measured, reproducible, and supported by wider contextual evidence.
An Auckland example is summarised (in abridged form) from Doutre, M., Archaeoastronomy and the Auckland Isthmus (Issue 26, Jun 2002):
“Using the volcanic hills of the Auckland Isthmus as horizon targets, an alignment system has been proposed that includes an approximate east–west equinox line. Part of this line is reported to run from stone markers once noted by 19th-century surveyors on Stockade Hill (Howick).
The line is described as continuing westward through a trench-like notch on Maungarei / Mt Wellington and then intersecting a standing stone on Ōwairaka / Mt Albert. More distant ranges (including the Waitākere and Coromandel ranges) are suggested as additional horizon reference points for sunrise and sunset.
Maungarei / Mt Wellington is described as having a “V”-shaped cut on the crest. In this interpretation, the notch frames the setting position of the equinoctial sun as viewed from Stockade Hill. Early surveyors also recorded stone pillars and smaller stones arranged near the hilltop, although these were later moved during 19th-century construction.
The author further suggests that, when viewed westward through the Maungarei / Mt Wellington “V”, the sightline passes toward Ōwairaka / Mt Albert, where a large stone marker is described as still present near a modern trig. In this reading, multiple hill-to-hill sightlines could have served both mapping and celestial-observation purposes, with one hill using another hill, range, or notch as an outer marker.
A group of enthusiasts, researchers and media representatives assembled on Stockade Hill, Howick, before sunset on the 20th of March 2000 to witness the equinoctial sun’s descent into the trench on Mt Wellington.”
Taken together, these examples point to a shared logic: repeated horizon observations can be materialised in built form so that significant dates become visible and collectively verifiable. In Southeast Asia this is most clearly seen in the orientation and viewing choreography of major temples; in New Zealand it is seen most securely in Indigenous astronomical knowledge systems, and—where measurements support it—in place-based sightlines and markers that appear to reference solar positions.
While Southeast Asian and New Zealand contexts differ in chronology, materials, and documentary record, both show how astronomical events can be recognised through repeatable alignments between observation points and the landscape horizon. Where those alignments are consistent, measurable, and supported by cultural context, they provide strong evidence that communities used the sky—especially the sun’s seasonal extremes and midpoints—to structure time, ceremony, and place.
To continue reading Series 5 we invite you to join us:
Blog 9: What insights have we gained regarding the links between Southeast Asian countries being the origin of New Zealand’s earliest settlers?
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