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The dry compass was first created by the Muslims. It was much cheaper than the lodestone compaasses
I should get home, home is North from here
If you don't know who I am, I am Khalid ibn Yazid. I am the one who improved the Astrolabe. With this device, I can tell how far up in the sky the celestial bodies are, and astronomical measurements just to name a few
Those stars up there are about 4 light years away.
I can also determine the time of a celestial event.
It works like this. First, I have to determine the suns ecliptic longitude. Then, set the astrolabe on the position just in front of the astrolabe. Third, rotate the reteand hold the position until the event is in postition. Last, read the time on the rule on your position on the limb.
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