THE SUNDIAL (DIAL WATCH Declining)
- Building sundials-
in the previous release we make a sundial horizontal dial in this release we will watch Sol declining dial. What
is a declining sundial?
Declining Solar Quadrant is one in which the projection surface (the surface graded to hours) is not perpendicular to the vertical plane containing the axis formed by the poles, ie that the sundial is not exactly facing north or south, but it is lopsided.
geometric and trigonometric development of the projection angles at the declining schedule contains some degree of difficulty, which is still salvageable with our high school math skills.
The following images show the mathematical development to find the projection angles hours from horizontal sundial.
- Building sundials-
in the previous release we make a sundial horizontal dial in this release we will watch Sol declining dial. What
is a declining sundial?
Declining Solar Quadrant is one in which the projection surface (the surface graded to hours) is not perpendicular to the vertical plane containing the axis formed by the poles, ie that the sundial is not exactly facing north or south, but it is lopsided.
geometric and trigonometric development of the projection angles at the declining schedule contains some degree of difficulty, which is still salvageable with our high school math skills.
The following images show the mathematical development to find the projection angles hours from horizontal sundial.
In this case, times are different angles from one side to the other, with reference to the line representing the 12 noon, ie, graduation is not symmetrical and this very important detail must be taken into account if we are projecting a vertical clock for a house facade. Similarly, depending on the value of the decline of the dial with respect to the North or South, only you can view the hours or from dawn to noon or from noon until sunset.
design Quadrant sundial declining presented in this post is designed to simulate the corner of a house, ie two adjacent walls and kept at 90 degrees relative to each other through the foot or gnomon. This concept is to achieve structural stability of the clock and ensures that the two walls that are kept up to 90 º. Quadrant angle to our project declínate Solar is 45 ° to the vertical plane that looks at the poles.
performing the necessary calculations to determine the quadrant angles downward schedules can make tracing them on paper to get this way the templates.
templates glued to a cardboard cut out. Assembly
the clock keeps the same look like this.
Note in the pictures held by the gnomon angle with respect to quadrants (in this case 45 degrees) and how are the quadrants corner for stability.
Vista Solar quadrant.
Side view of clock
To read the time on this watch, we must orient so that the gnomon is aligned with the axis of the poles, ie pointing to them in the same way we did with previous clocks.
Local Solar Time: 8:00 AM
dial clock dial downward and horizontal.
Clock equatorial sun dial and the watch dial downward.
This last image shows clearly the deflection angle of the sundial has declining compared to the equatorial sundial.
