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並前往https://books.google.com.tw/books?id=JP_ekCK1MQgC&pg=PA171&lpg=PA171&dq=Sunrise+vector&source=bl&ots=zwGaFsk8jN&sig=ACfU3U2WPWFhaz19tt0rervwN6iK251ZyA&hl=zh-TW&sa=X&ved=2ahUKEwjOq-qxr8n_AhXZAYgKHR6DAdEQ6AF6BQi6AhAD

History of Physical Astronomy: From the Earliest Ages to the ...

But , as the sun is the natural centre of the planet's motion ... if we know the length of the radius vector of the planet , and the position of the earth ...

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