Abstract
“The earth, you know, turns round once in every 24 hours, or, in common language, the sun moves round the earth in that time; in what time, then, will the sun travel over 15 degrees? and why? over 1° (degree) of motion? over 1' (minute) of motion? By the foregoing, we see that every degree of motion makes a difference in time of 4 minutes, and every minute of motion a difference of 4 seconds. Now, since longitude is reckoned in degrees round the earth, can you tell me hmv to find the difference in time between one place and another, after knowing their difference in longitude?"* When this book was written, the relation between the difference in longitude of two places and their difference in time was an academic matter. Travel and communications were slow. Local time was sufficient.
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