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THE SUNDIAL (HORIZONTAL DIAL WATCH)

THE SUNDIAL (HORIZONTAL DIAL WATCH )
- Building sundials-

horizontal dial The watch like the previous case is a bit more complex in design than the equatorial quadrant, indicating divisions of the time does not correspond to the simple division into equal parts angular tilt 15 degrees per hour as in the case of sundials equatorial dial. In the same way as for vertical dial clocks, the gnomon of this watch now has a triangular shape has to be properly oriented parallel to the axis of the world. Once done, the time is indicated by the projection of the shadow of the upper edge of the triangle that makes the gnomon on the degree horizontal plane. The

following image shows the mathematical development to find the projection of the equatorial dial on the horizontal plane and thus obtain the horizontal sundial for our little project.

Made the path, we have the pattern for making the sun clock

Cut the pieces and assembled the watch, it keeps the look shown in the figures below.

Note in the picture the triangular shape of the gnomon, the inclination of the upper edge of the triangle with respect to the horizontal is just the angle that corresponds to the latitude of the place, so that once placed our sundial in a sunny spot, the top edge of the gnomon is parallel to the axis of the poles and pointing north. The time is marked by the shadow that is projected onto the horizontal dial.

Local Solar Time: 1:30 PM

horizontal dial clock dial with the vertical.

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THE SUNDIAL (VERTICAL DIAL WATCH)

THE SUNDIAL (VERTICAL DIAL WATCH )
- Building sundials-

The watch dial vertical is more complex in design than dial equator, because the divisions indicating the time does not correspond to the simple division angle equal parts of 15 degrees of tilt per hour, but a graduated scale distorted by the vertical projection of the quadrant equator. However, for this instrument is functional, the gnomon must be parallel to the axis of the world, pointing to the poles in the same manner as the sundial equatorial dial.

With our knowledge of geometry and trigonometry in high school we acquired the ability to design and projecting a dial sundial vertical, horizontal and declining among others, once assimilated the idea of \u200b\u200bthe equatorial quadrant projections on other surfaces.

The following image shows the mathematical development to determine the projection of the equatorial quadrant hour angles on the vertical quadrant.

As in the case of dial sundial equatorial foot on this clock also serves both functions, support and gnomon. The following figures show some of the steps for making clock model.

Templates.

Templates cut and pasted to the cardboard base.




Cutting
binding groove of the foot to support gnomon.


union slots completed.


Quadrant front or north side.


Quadrant
rear or southern side.



Front View.

Side view.

Note in side view the sundial is completely vertical, but the upper surface of the foot, which is the gnomon is tilted. The angle of inclination with respect to the horizontal have the same value as the latitude.

To view the local solar time, we must put our clock in a sunny spot and oriented in the same way as previous clocks, ie, the gnomon must point to the poles and parallel to them.

local solar time: 1:30 PM

vertical clock with the clock equator.

In the next release, try to make a solar clock horizontal dial.