33° 50' 55" S 151° 12' 4" E - Observatory Trig Point E - Sydney, Australia
Posted by: Groundspeak Charter Member BruceS
S 33° 51.584 E 151° 12.270
56H E 333907 N 6251946
Coordinates listed on sign giving information about historic and also the current trig point located at the Sydney Observatory.
Waymark Code: WMFV9H
Location: New South Wales, Australia
Date Posted: 12/02/2012
Published By:Groundspeak Premium Member saopaulo1
Views: 14
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From information sign:

Stone pyramid for surveying Sydney

This historic stone pyramid is survey marker or trig station, erected about 1880. Its accurate position  measured by the Observatory's transit circle telescope, was used in survey Sydney.

Surveyors would climb to the top of the marker and measure angles to visible landmarks.  With these angles they could used triangulation or trigonometry to draw up maps of property boundaries and sewage lines.

As the area around the Observatory became built up, a new survey maker was placed high on top of the time ball tower.  Trig E, as it was known, was used by surveyors until the early 1980s, when the marker was removed for safekeeping.

Recently the survey marker on top of the tower was replaced and position was re-established with the latest GPS techniques by the NSW Department of Lands.  Now known as Observatory E. its coordinates are:  latitude 33° 50' 55" S, longitude 151° 12' 4" E.
Type of structure: Building

Difference between the post coordinates and your GPSr reading:
There is a significant difference between coordinates for unknown reasons. The coordinates listed and the actual coordinates. Those listed are located are located north in the harbor, must be a misprint on sign.

Reason for the coordinates: Sign gives location of the trig point on top of Observatory
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Recent Visits/Logs:
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Aussiebrian visited 33° 50' 55" S 151° 12' 4" E - Observatory Trig Point E - Sydney, Australia 11/02/2022 Aussiebrian visited it
bella at waggy visited 33° 50' 55" S 151° 12' 4" E - Observatory Trig Point E - Sydney, Australia 08/01/2016 bella at waggy visited it
Grahame Cookie visited 33° 50' 55" S 151° 12' 4" E - Observatory Trig Point E - Sydney, Australia 01/10/2016 Grahame Cookie visited it
rubymoon05 visited 33° 50' 55" S 151° 12' 4" E - Observatory Trig Point E - Sydney, Australia 05/31/2014 rubymoon05 visited it

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