orbital circle of moon has four hinges

Categories: Comparisons

An example of simile in scientific writing:

"Moreover, the orbital circle of the moon with its four 'hinges' or cardinal points revolves obliquely around the centre of the Earth in a regular movement of approximately 3' per day, and it completes is revolution in 19 years."

Nicolaus Copernicus (1543/1995) On the Revolutions of the Heavenly Spheres (Translator: Charles Glenn Wallis) Amherst, New York: Prometheus Books

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The reference to 19 years refers to the 19-year 'Metonic' cycle, the time it takes (approximately) for the moon's phases to repeat in terms of the days of the earthly calendar.

Author: Keith

Former school and college science teacher, teacher educator, research supervisor, and research methods lecturer. Emeritus Professor of Science Education at the University of Cambridge.