Equation of time

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Martin Braun Notos
with indication of the
equation of time
© Martin Braun


The equation of time is the difference between time as read from a sundial and time as read from a clock or watch.

Due to the elliptical orbit of the earth the two times only match on April 15, June 14, September 1 and Dec 24th. On all other days, the deviation reaches from minus 16 minutes 23 seconds (4 November) to plus 14 minutes 22 seconds (on February 11).

A manufacturer who specializes particularly in wristwatchs with equation of time display is Martin Braun. His model Notos also offers the additional complication of the display of the declination.