A compound dial: horizontal plus horizontal azimuth

中文讀者請至http://blog.xuite.net/nycl.chiu/blog/22371023
以及 http://blog.xuite.net/nycl.chiu/blog/22374662

In the previous paper, a horizontal azimuth dial was designed without using long vertical needle as shadow casting subject but a slit. In order to read the standard time directly from the dial, EoT analemmas with sharp ends were applied. However, to most people, this is another baffle. There I decided to make another one whose calendar lines go from Jan. 1st to Dec. 31st. See Fig.1.

Then I did the same thing to a horizontal dial and put it with the azimuth dial in a CD box so that no compass is needed. Fig. 2 shows the compound dial is in using.