Sundial Angle Calculator

This sundial angle calculator helps you to find the gnomon angle. Sundial is a device used to know the time of a day with the apparent position of the sun in the sky. It has a flat dial and a gnomon, which casts the shadow over the dial. As per the sun's position, the gnomon aligns with different sundial hour lines. It uses the edge of a shadow to indicate the time. Enter latitude and sundial time in the horizontal sundial shadow angle calculator to know the sundial angle.

Horizontal Sundial Shadow Angle Calculator | Sundial Hour Line Calculator

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This sundial angle calculator helps you to find the gnomon angle. Sundial is a device used to know the time of a day with the apparent position of the sun in the sky. It has a flat dial and a gnomon, which casts the shadow over the dial. As per the sun's position, the gnomon aligns with different sundial hour lines. It uses the edge of a shadow to indicate the time. Enter latitude and sundial time in the horizontal sundial shadow angle calculator to know the sundial angle.

Code to add this calci to your website  Formula:

Sundial Angle = tan-1(sin(l)×tan(15×t)) Where, l = Latitude t = Hours

Example:

Find the Horizontal sundial shadow angle if the latitude of your region is 53o for 4 :00 PM.

Solution:

Sundial Hour Line = tan-1(sin(53)×tan(15×4))
= 54.136°