The research of the sun shadow positioning
- https://doi.org/10.2991/mmme-16.2016.178How to use a DOI?
- shadow positioning; solar elevation; shadow length change model
In recent decades, with the level of material life improves quickly, more and more people are on fire for out-door adventure. They usually trek in desert and wasteland. However the case that compass or communication equipment is out of order happens frequently. For someone who lack direction, it is easy for them to be lost. So it is a meaningful work to research a way to find position with the help of the sun shadow. The sun shad-ow position is a huge project. Our paper aims to solve one link of the whole project. As the time and location change, the length of pole's shadow change, which we make research on to get the exact function model. As is known to all, earth-sun distance is much higher than mean radius of the earth. So we can approximately think the sunlight shining on the earth is parallel light. If we believe pole length is constant. The shadow length only relates with solar elevation angle. So we can use solar declination angle, solar hour angle, geo-graphical longitude and latitude to calculate solar elevation angle. In a word, we use parameters such as date, longitude, latitude and time to refer to above variable, with the help of geographical knowledge. And then we establish the model which describe the change of shadow length. At last we apply the model in practice. The result prove that our model is reasonable.
- © 2016, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Lingyu Huang PY - 2016/10 DA - 2016/10 TI - The research of the sun shadow positioning BT - Proceedings of the 2016 4th International Conference on Mechanical Materials and Manufacturing Engineering PB - Atlantis Press SP - 743 EP - 745 SN - 2352-5401 UR - https://doi.org/10.2991/mmme-16.2016.178 DO - https://doi.org/10.2991/mmme-16.2016.178 ID - Huang2016/10 ER -