Andreas Cellarius
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Andreas Cellarius was a Dutch–German cartographer and cosmographer best known for his 1660 Harmonia Macrocosmica, a major star atlas.
Cellarius's illustration of Copernican heliocentrism, from the Harmonia Macrocosmica
Occam's razor
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In philosophy, Occam's razor is the problem-solving principle that recommends searching for explanations constructed with the smallest possible set of elements. It is also known as the principle of pa
Part of a page from John Duns Scotus's book Commentaria oxoniensia ad IV libros magistri Sententiarus, showing the words: "Pluralitas non est ponenda sine necessitate", i.e., "Plurality is not to be posited without necessity"
Manuscript illustration of William of Ockham
Possible explanations can become needlessly complex. It might be coherent, for instance, to add the involvement of leprechauns to any explanation, but Occam's razor would prevent such additions unless they were necessary.