If you want to take beautiful night sky pictures with your DSLR and you live between 15 degrees and 55 degrees north latitude you might want to check out OpenAstroTracker . If you have a 3D printer it will probably take about 60 hours of printing, but you’ll wind up with a pretty impressive setup for your camera. There’s an Arduino managing the tracking and also providing a “go to” capability.
The design is over on Thingiverse and you can find code on GitHub . There’s also a Reddit dedicated to the project . The tracker touts its ability to handle long or heavy lenses and to target 180 degrees in every direction.
Some of the parts you must print are specific to your latitude to within 5 degrees, so if you live at latitude 43 degrees, you could pick the 40-degree versions of the parts. So far though, you must be in the Northern hemisphere between 15 and 55 degrees.
What kind of images can you expect? The site says this image of Andromeda was taken over several nights using a Soligor 210mm f/4 lens with ISO 800 film.
Not bad at all! Certainly not the view from our $25 department store telescope.
If you’d rather skip the Arduino, try a cheap clock movement . Or you can replace the clock and the Arduino withyourself.
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数学建模（原书第5版）
[美] Frank R. Giordano、[美] William P.Fox、[美] Steven B.Horton / 叶其孝、姜启源 / 机械工业出版社 / 2014-10-1 / 99.00元
《华章数学译丛：数学建模（原书第5版）》旨在指导学生初步掌握数学建模的思想和方法，共分两大部分：离散建模和连续建模，通过本书的学习，学生将有机会在创造性模型和经验模型的构建、模型分析以及模型研究方面进行实践，增强解决问题的能力。 《华章数学译丛：数学建模（原书第5版）》对于用到的数学知识力求深入浅出，涉及的应用领域相当广泛，适合作为高等院校相关专业的数学建模教材和参考书，也可作为参加国内外数......一起来看看 《数学建模（原书第5版）》 这本书的介绍吧!
