在寻找天王星轨道的差异时，英国人约翰·考奇·亚当斯和法国人于尔班·勒威耶分别独立计算着这个未知世界的质量和位置。

By looking for discrepancies in Uranus's orbit, Englishman John Couch Adams and Frenchman Urbain Le Verrier each independently calculated the unseen world's mass and position.

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戈伦比威斯基，比林斯利和耶格尔随后加入了另一个级别的变革，中阶变化。中阶变化是存在于一阶和二阶变化这两个极端之间的变化。

Golembiewski, Billingsley, and Yeager8 subsequently added another level of change, defining middle-order change as lying somewhere between the extremes of first - and second-order change.

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