Abstract

Before the wide distribution of standard time signals by telegraph and radio in the late nineteenth and early twentieth centuries, the reported times of earthquakes usually were based on times established from observations of local apparent noon on a sundial. This paper proposes to use the calculation of the actual standard sun transit time to correct these local times of earthquakes so they may be listed with universal times (UT). Examples are shown of how this method would apply to two nineteenth-century earthquakes in eastern North America.

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