<a href="https://en.wikipedia.org/wiki/Shepherd_gate_clock" class="extiw" title="en:Shepherd gate clock">Shepherd gate clock</a>, the clock existing "Greenwich Mean Time" , Royal Observatory Greenwich
<a href="https://ja.wikipedia.org/wiki/user:Takasunrise0921" class="extiw" title="ja:user:Takasunrise0921">Takasunrise0921</a>
CC BY 2.5
<a href="https://ja.wikipedia.org/wiki/user:Takasunrise0921" class="extiw" title="ja:user:Takasunrise0921">Takasunrise0921</a>