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It is possible to calculate tidal information from this device
A site specific and longitude corrected sundial is also displayed along with the Equation of Time expressed as an integer around the calendar for every day of the year
Using the calculations given in the Moondial chart the sundial will not only read time accurately in sunlight but also tell time at night, by moonlight
























Such Moondial instruments have been known from at least the late 1500's and probably much earlier














