A clock measuring sidereal time in terms of 24 equal divisions of a sidereal day.
- After a year, the sidereal clock would be exactly a day faster: there are 366 sidereal days in a year.
- In fact a sidereal clock and an ordinary clock tick at different rates because they are based upon different astronomical objects.
- This firm was in business in London from about 1820 to 1840, and nearly all of the sidereal clocks which came to America during this period were made by them.
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