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That is, there is a distinction between the temperature at which water boils, 100 ☌, and the temperature difference between 50 ☌ and 150 ☌, also written 100 ☌.
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When one is being scientifically pedantic, there is a distinction with affine points and vectors between them. This firmly suggests that the symbol represents a raised zero, and I shall edit the text accordingly. But nowhere in this book have I been able to find the modern angular notation ° ' " used in writing angles. It is possible that Peletier is the originator of the ° for degrees. "Integers when multiplied by seconds make seconds, when multiplied by thirds make thirds" (fol. The denomination ° for integers or degrees is necessary to impart generality to this mode or procedure. This is the first modern appearance that I have found of ° for integra or “degrees.” It is explained that the denomination of the product of two such denominate numbers is obtained by combining the denominations of the factors minutes times seconds give thirds, because 1+2=3. The first modern appearance of the degree symbol ° Cajori found is in the revised 1569 edition of Gemma Frisius, Arithmeticae practicae moethodus facilis by Gemma Frisius (1508-1555), although the symbol appears in the Appendix on astronomical fractions due to Jacques Peletier (1517-1582) and dated 1558. What we need here is some evidence of when the degree symbol was first used. It seems more credible that a degree symbol is just a small raised zero. If you look at the symbols for minutes and seconds (and one sixtieth of a second is a 'third'), they are just the roman numerals for 1, 2, 3 etc. The preceding unsigned comment was added by 67.188.172.165 (talk ĭo you have an ISBN? Or author and title? -Keenan Pepper 18:19, 22 September 2006 (UTC) Cajori writes: This is the first modern appearance that I have found of ° for integra or “degrees.” It is explained that the denomination of the product of two such denominate numbers is obtained by combining the denominations of the factors minutes times seconds give thirds, because 1+2=3. Do you have an ISBN? Or author and title? - Keenan Pepper 18:19, 22 September 2006 (UTC)
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The preceding unsigned comment was added by 67.188.172.165 ( talk