--- title: "Meaning & Key Takeaway of: Yet the widespread planetary theories…" description: "\"Yet the widespread planetary theories, advanced by Ptolemy and most other astronomers, although consistent with the numerical data, seemed likewise to ..." image: "https://sms4smile.com/quotes/i/1ff/nicolaus-copernicus-10074_adequate_yet-the-widespread-planetary-theories-ad_496084.jpg" --- # Yet the widespread planetary theories, advanced by Ptolemy… ![“Yet the widespread planetary theories, advanced by Ptolemy and most other astronomers, although consistent with the numerical data, seemed likewise to present no small difficulty. For these theories were not adequate unless they also conceived certain equalizing circles, which made the planet…” quote by Nicolaus Copernicus](https://sms4smile.com/quotes/i/1ff/nicolaus-copernicus-10074_adequate_yet-the-widespread-planetary-theories-ad_496084.jpg) [Download](https://sms4smile.com/quotes/i/1ff/nicolaus-copernicus-10074_adequate_yet-the-widespread-planetary-theories-ad_496084.jpg) [Open image](https://sms4smile.com/quotes/i/1ff/nicolaus-copernicus-10074_adequate_yet-the-widespread-planetary-theories-ad_496084.jpg) > “Yet the widespread planetary theories, advanced by Ptolemy and most other astronomers, although consistent with the numerical data, seemed likewise to present no small difficulty. For these theories were not adequate unless they also conceived certain equalizing circles, which made the planet appear to move at all times with uniform velocity neither on its deferent sphere nor about its own epicycle's center.” [Nicolaus Copernicus](https://sms4smile.com/quotes/author/nicolaus-copernicus/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. Copernicus noted that Ptolemaic models required complex circles to force uniform planetary motion, revealing their inadequacy. **In simple terms:** Ptolemaic circles were forced to fit data, showing flaws. Key Takeaway Recognize hidden complexities in accepted models. Themes astronomy history of science model critique Mood curious critical inquisitive Type analytical historical When to use this quote - teaching astronomy - historical analysis - model building - science communication Key Concepts uniform motion epicycles deferent sphere Questions to Reflect On - What assumptions are we forcing into current models? - How can we simplify without losing accuracy? A Different Perspective The model still struggled to explain observed variations without added mechanisms. ★ ★ ★ ★ ★ No ratings yet [Adequate](https://sms4smile.com/quotes/about/adequate/) [Advanced Ptolemy](https://sms4smile.com/quotes/about/advanced-ptolemy-4234169/) [All time](https://sms4smile.com/quotes/about/all-time/) [Astronomers](https://sms4smile.com/quotes/about/astronomers/) [Certain](https://sms4smile.com/quotes/about/certain/) [Circles](https://sms4smile.com/quotes/about/circles/) [Consistent](https://sms4smile.com/quotes/about/consistent/) [Data](https://sms4smile.com/quotes/about/data/) [Difficulty](https://sms4smile.com/quotes/about/difficulty/) [Made](https://sms4smile.com/quotes/about/made/) [Moving](https://sms4smile.com/quotes/about/moving/) [Planetary Theories](https://sms4smile.com/quotes/about/planetary-theories-4234166/) [Planets](https://sms4smile.com/quotes/about/planets/) [Ptolemy Astronomers](https://sms4smile.com/quotes/about/ptolemy-astronomers-4234167/) [Science](https://sms4smile.com/quotes/about/science/) [Spheres](https://sms4smile.com/quotes/about/spheres/) [Theories Adequate](https://sms4smile.com/quotes/about/theories-adequate-4234168/) [Theory](https://sms4smile.com/quotes/about/theory/) [Uniforms](https://sms4smile.com/quotes/about/uniforms/) [Velocity](https://sms4smile.com/quotes/about/velocity/) [Widespread Planetary](https://sms4smile.com/quotes/about/widespread-planetary-4234170/) ## Related quotes > [She continued weeping until the heat of her tear water, the sheer velocity of its flow, finally obscured the already vague circumstances of its…](https://sms4smile.com/quotes/tom-robbins/she-continued-weeping-until-the-heat-of-her-tear-water-the-sheer/) [Tom Robbins](https://sms4smile.com/quotes/author/tom-robbins/) > [I started thinking about how life is a lot like getting pushed out of a plane. 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