Sundials equation of time. A well-chosen sundial not only serves as an elegant garden accent but also functions as an accurate time-telling instrument when properly designed and installed. The Equation of Time is usually combined together with the longitude correction. Clocks and watches tell "clock time". In the course of the Sun's daily east-to-west transit of the sky, the Sun crosses the meridian, an imaginary line running from north to south that passes overhead and divides the sky into equal halves. (see page 'Displaying the Equation of Time'). Neither kind of time is intrinsically "better" than the other - they are both useful and interesting for their separate purposes. Calculating the Sun's Right Ascension, Declination & EoT,Code to do the Calculations,An Unrealised Heliochronometer Synopsis The annual, cyclic variation between mean solar time shown on uniformly running clocks and apparent solar time displayed on sundials. The Equation of Time "Sun time" and "clock time" Sundials tell "sun time". There are dials which compensate for the Equation of Time, but they are complicated. In any sundial, the part that casts the shadow is called the gnomon. dcky uizjw ptjz wmmspb uwvx hrle bmkdnu ehcfck wocou llfdu