單純垂直方位日晷 Simple Vertical azimuth sundial

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In low latitude zone area, horizontal azimuth sundial is not a good choice if one likes to make and use a sundial because its time resolution is very low during summer time. A simple vertical azimuth sundial,on the contrary, is much better. A model for 24.79 N (NTHU, Hsinchu, Taiwan) is made.

Fig. 1 gives the south side and Fig. 2 shows the north side. To use it, one should draw a true west-east line, put it on the line and then hold it vertical. If a horizontal surface is more convenient for him to find, then a supporting bottom can be made as shown in figures.