Talk:perturbation

The "Astronomy: Variation in an orbit due to the influence of external bodies"(3) quotation seems to be completely off, it's the next phrase after the quotation related to "(1)",

"1815, Jane Austen, Emma, volume I, chapter 5: Emma is spoiled by being the cleverest of her family. At ten years old, she had the misfortune of being able to answer questions which puzzled her sister at seventeen. She was always quick and assured: Isabella slow and diffident."

Firstly it doesn't mention the word "pertubation" or any for of it, further, it has nothing to do with astronomy.