This geodetic life

“Never judge a geologist, we all have our faults…”

On my recent trip to the summit of Brown Hill, I encountered this very specific arrangement of stones. A little research revealed it to be a triangulation station, or more informally a trig point. A station such as this is set up with a known position and elevation. They are the key to geodetic surveying. This is the understanding of the Earth’s shape, size, orientation and gravity. The father of geodesy was Pythagoras, but the Brown Hill trig was actually established by Col William Light. Along with other trig points on Mt Lofty, Green Hill, Flagstaff Hill and Black Hill, it was used for the 1837 survey that established the position and orientation of the Adelaide City Centre. #beforewehadgps #letsmakelemonade

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