File:"Knot with 48 crossings" on a clock face.svg

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The integers from 1 to 12 written on the image number either the twelve hours of half a day on a clock face or the twelve bends of a race track.  There are forty‑eight bridges along the route, no dangerous crossings. Interesting loop in arithmetic.


English: The integers from 1 to 12 written on the image number either the twelve hours of half a day on a clock face or the twelve bends along a race track.  Along the loop there are forty‑eight bridges.  Every straight line crosses eight other parts of the track, passing alternatively under and above.  The twelve bends are parts of parabolas produced by 'q' commands in SVG language.  Through this drawing of knot, it is easy to explain arithmetic modulo 12.  For example, if it is eleven o'clock now, five hours later the clock hand will indicate four o'clock, because  11 + 5 = 4  modulo 12. By turning clockwise, we pass through the terms of an arithmetic progression with common difference  +5  or  –7.  This also explains  "{12,5}":  a Schläfli notation that denotes nonconvex regular dodecagons, all similar.  For more informations see another version.
Français :
Les nombres entiers de 1 à 12 inscrits dans l’image numérotent soit les douze heures d’une demi‑journée sur un cadran d’horloge, soit les douze virages d’une piste de course.  Le long du circuit il y a quarante‑huit ponts.  Chaque ligne droite croise huit autres parties de la piste, en passant alternativement en dessous et au‑dessus.  Les douze virages sont des portions de paraboles produites par des commandes 'q' en langage SVG.  Avec ce dessin de nœud, il est facile d’expliquer l’arithmétique modulo 12.  Par exemple, si maintenant il est onze heures, dans cinq heures l’aiguille de l’horloge indiquera quatre heures, parce que  11 + 5 = 4  modulo 12.  En tournant dans le sens des aiguilles d’une montre, on passe par les termes d’une progression arithmétique de raison  +5  ou  –7.  Cela explique aussi  "{12,5}" :  une notation de Schläfli qui désigne des dodécagones réguliers étoilés, tous semblables.  Pour plus d’informations voir une autre version.
Date 13 July 2012
Source Own work
Author Baelde
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current06:48, 7 August 2012Thumbnail for version as of 06:48, 7 August 2012750 × 750 (3 KB)Baelde (talk | contribs) central ornament more interesting 
19:35, 2 August 2012Thumbnail for version as of 19:35, 2 August 2012750 × 750 (3 KB)Baelde (talk | contribs) knot with lines more thick 
04:51, 15 July 2012Thumbnail for version as of 04:51, 15 July 2012750 × 750 (3 KB)Baelde (talk | contribs)the PNG conversion was bad 
04:26, 15 July 2012Thumbnail for version as of 04:26, 15 July 2012750 × 750 (2 KB)Baelde (talk | contribs)SVG code improved by using  transform ="rotate (…)" 
09:23, 13 July 2012Thumbnail for version as of 09:23, 13 July 2012750 × 750 (3 KB)Baelde (talk | contribs){{Information |Description ={{en|1=We can consider that the integers from 1 to 12, written on the clock face, are the twelve hour numbers, or the numbers of twelve bends along a race track.  Along the loop, there are forty-eight brid...

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