Assertion: planet's moon | /r/AtLocation | earth-aligning point
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text: A more exact opposition occasionally occurs with mathematical regularity if the moon is at its usual sun and earth-aligning point so that it appears full and happens to be aligning with the ecliptic (earth's orital plane) during the descending or ascending phase of its 5° inclined (tilted) orbit, which is more concisely termed at a node of its orbit, in which case, a lunar eclipse occurs.