Making a Clock-Accurate Sundial 在线电子书 图书标签:
发表于2024-11-13
Making a Clock-Accurate Sundial 在线电子书 pdf 下载 txt下载 epub 下载 mobi 下载 2024
Sundials have been around for ages, but Sam Muller's is specially Customized to Your Location, easy to make and use from his diagrams and directions. By its shadow you can read correct time, and observe the effects of the earth's tilt, rotation, and changing orbital speed. On a moonlit night, from the shadow cast on your now 'moondial, ' you will notice the moon's counterclockwise orbit of the earth.
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Making a Clock-Accurate Sundial 在线电子书 pdf 下载 txt下载 epub 下载 mobi 下载 2024