https://ja.wikipedia.org/wiki/太陽
https://ja.wikipedia.org/wiki/冥王星
https://www.wolframalpha.com/input/?i=2*arctan%281392000+km%2F%282*39.44506973+au%29%29+in+degree&lang=ja
https://www.wolframalpha.com/input/?i=2*arctan%281392000+km%2F%282*49.31614768+au%29%29+in+degree&lang=ja