The construction of Fort Denison was completed on 14 November 1857, and in 1865 a tide gauge was established by the Government Astronomer from the Sydney Observatory, and ever since, seas levels have been measured at Fort Denison, providing one of the longest running sea level records in the world.
No less an authority than the US National Oceanic and Atmospheric Administration (NOAA) records that the sea level rise at Fort Denison is "averaging 0.65 millimeters/year based on monthly mean sea level data from 1886 to 2010".
Sea levels, page-69
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