Making a Clock-Accurate Sundial 在線電子書 圖書標籤:
發表於2024-11-29
Making a Clock-Accurate Sundial 在線電子書 pdf 下載 txt下載 epub 下載 mobi 下載 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 在線電子書 pdf 下載 txt下載 epub 下載 mobi 下載 2024