- 17. NOVEMBER * August Ferdinand Mobius *

    1. NOVEMBER * August Ferdinand Mobius * 321日  あと44日 TOKYO_SUNRISE-06:18 SUNSET-16:33 MOON-12.2 DAYS

_ Arabian cobra becomes 12,000th animal added to ark of at-risk https://www.nationalgeographic.com/animals/article/arabian-cobra-milestone-species-in-photo-ark

将棋の日, ドラフト記念日, 蓮根の日, 国際学生の日(International Students' Day), 肺がん撲滅デー, 島原防災の日, 談山神社もみじ祭(奈良県桜井市),

1790年 アウグスト・フェルディナント・メビウス (独:天文学者,数学者(トポロジー,整数論)) * August Ferdinand Mobius * http://www.encyclopedia.com/doc/1G2-3407500199.html

_ Möbius and his Band - Professor Raymond Flood https://youtu.be/-ECOwPNkoys _ Möbius strip: Mathematical origami https://youtu.be/wAMxuYqPTXI _ Cutting a Möbius strip in half (and more) | Animated Topology | https://youtu.be/XlQOipIVFPk

https://dilbert.com/strip/2021-11-16