Weekly Review
This week I learned a lot about the sun’s movement, and I learned to understand the very complex sun trajectory icons, including the Stereographic sunpath and the sundials of the same latitude and different seasons, which help me have a more in-depth understanding of the sun’s movement from a geographic level.
Sunlight nomen/sundial workshop
It was only through the teacher’s explanation that I gained an understanding of this seemingly complex diagram. It turned out that the diagram was based on the trajectory of the changing shadows of objects at a fixed latitude. It also reminded me of the sundial, an ancient Chinese timekeeping tool.
I chose September 21st and March 21st at 56°N latitude for my research. This is the straightest line on the chart, and it describes the shadow’s end-movement path from 7am to 5pm. Watch the video below:
Stereographic chart
I followed the instructor’s steps and began to gradually understand the principles of using the drawings. The first selection of data was made at 2pm in May and the final angle obtained was 52°. I then chose 3pm in June for the test and ended up with an angle of 58°.
Difficulties that I met
The Stereographic chart was a little difficult for me to understand, not only because of the complexity of its curved shape, but also because it was difficult to imagine its three-dimensional movement. I tried to find more videos and pictures that I could easily understand.
Sun path geometry http://notesfromnoosphere.blogspot.com/2012/05/simple-geometry-of-sun-paths.html
sun paths at 40°N http://notesfromnoosphere.blogspot.com/2012/05/simple-geometry-of-sun-paths.html
Want to continue my journey in week 2?
For more posts on this week, please click here.
Leave a Reply