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The Vomnin calendar was the system of time measurement used by the Vomnin Confederacy. Part of the calendar was the sun cycle, which measured how long it took the companion star of the Vomnin's primary star to orbit that primary.
In 2381, DTI special agents Teresa Garcia and Meyo Ranjea memorized this calendar because they were going to deal with the Vomnin. (DTI novel: Watching the Clock)