パワーハウスミュージアムのインスタグラム(powerhousemuseum) - 5月16日 17時00分

Our historic time ball will be returning to service on top of Sydney Observatory tomorrow. Here it is (or half of it anyway) in our Ultimo workshop, almost ready after an intense restoration project.

Before radio the only way to convey accurate time was through a visual signal. Accurate time was especially important to ships setting out on a long voyage as they needed to adjust and calibrate their chronometers.
In the 1850s Sydney was becoming a busy port with ships arriving from, and departing for, a variety of distant places. There was an urgent need for a time ball to provide accurate time for this shipping traffic.
Astronomers would communicate the time to people in the city and harbour by dropping the time ball at exactly 1pm every day.

#sydneyobservatory #timeball #MAAScollection

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