File:Academ Bijection between angles and 12 positions of a clock hand.svg
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DescriptionAcadem Bijection between angles and 12 positions of a clock hand.svg |
English: Twelve angles defined modulo 360 degrees correspond to times, defined modulo 12 hours. For example, a clock hand has one only position numbered zero or twenty-four, because 0 = 24 modulo 12. This position corresponds to 90 or –270 degrees modulo 360 degrees. Thus we identify direction and sense of a ray or a vector in polar coordinates, or the angle of a given rotation, or the argument of a given complex number.
The drawing on the clock face evokes arithmetic progressions with common differences 5 or 7 modulo 12. For example, by turning clockwise from 1, we pass through the terms: 1, 6, 11, 4, 9, 2, 7, 12, 5, 10, 3, 8. This sequence corresponds to a progression with common difference 210 degrees modulo 360 degrees. If the twelve positions of a clock hand are numbered in set P of twelve elements, from 1 to 12 modulo 12, and if set A consists of the angles written within the image, a bijection B from P onto A can be defined by B( t ) = 90 – 30 t. For example, B( 12 ) = 90 – 30 × 12 = 90 degrees modulo 360 degrees.Français : Douze angles définis modulo 360 degrés correspondent à des temps, définis modulo 12 heures. Par exemple, une aiguille d’horloge a une seule position numérotée zéro ou vingt-quatre, parce que 0 = 24 modulo 12. Cette position correspond à 90 ou –270 degrés modulo 360 degrés. Ainsi nous identifions direction et sens d’une demi-droite ou d’un vecteur en coordonnées polaires, ou l’angle d’une rotation donnée, ou l’argument d’un nombre complexe donné.
Le dessin sur le cadran de l’horloge évoque des progressions arithmétiques de raisons 5 ou 7 modulo 12. Par exemple, en tournant dans le sens des aiguilles d’une montre à partir de 1, nous passons par les termes : 1, 6, 11, 4, 9, 2, 7, 12, 5, 10, 3, 8. Cette suite correspond à une progression de raison arithmétique 210 degrés modulo 360 degrés. Si les douze positions d’une aiguille d’horloge sont numérotées dans l’ensemble P de douze éléments, de 1 à 12 modulo 12, et si l’ensemble A est constitué des angles indiqués dans l’image, une bijection B de P sur A peut être définie par B( t ) = 90 – 30 t. Par exemple, B( 12 ) = 90 – 30 × 12 = 90 degrés modulo 360 degrés. |
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Source | Own work |
Author | Baelde |
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SVG development InfoField | This trigonometry was created with a text editor. This trigonometry uses embedded text that can be easily translated using a text editor. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:17, 1 August 2012 | 875 × 750 (4 KB) | Baelde (talk | contribs) | More contrasted, SVG code improved | |
09:55, 30 July 2012 | 875 × 750 (4 KB) | Baelde (talk | contribs) | More contrasted | ||
07:54, 26 July 2012 | 875 × 750 (4 KB) | Baelde (talk | contribs) | {{Information |Description ={{en|1=Twelve angles defined modulo 360 degrees correspond to times, defined modulo 12 hours. For example, a clock hand has one only position numbered zero or twenty-four, because {{No... |
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