Horizontal Sundial Shadow Angle Formula

A sundial is a device that tells the time of day by the apparent position of the Sun in the sky. The horizontal dial is pole - style. It is one of the most commonly used sundials because it can be used to tell the time whenever the Sun is shining since the dial plate is placed horizontally to the ground. Some vertical dials can be used during restricted hours of the day. Given here is the Horizontal sundial shadow angle formula to calculate for the Sundial Angle in hours and minutes.


Sundial Angle = tan-1(sin(l)×tan(15×t))


l = Latitude
t = Hours

Related Calculator:

Also, given here an online calculator that displays sundial hour line angles for any latitude. The angle of the gnomon is the same as the location's latitude. Use the Horizontal sundial shadow angle formula to verify for your calculated results based on the sun's position.

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