From crude manual time clocks to sophisticated satellite-based control devices, the pace of change of the time clocks used within street lighting has been breath-taking, especially in the second half of the twentieth century. Despite the headline, this article isn't going to be about the famous Stephen Hawking book on theoretical cosmology. Rather, through a look at various time zones and measures of time, I intend to outline how our understanding of how we measure time has evolved and changed and, from that, led to how time clocks are used today, including within street lighting.
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