#明神

[kiichilog]

上高地 中部山岳国立公園

Kamikochi Cyubu sangaku national park

明治42年から高山植物の採取禁止になるなど、自然保護に対する歴史は長い。10月の3連休は激込みです。

[shirasuphoto]

No.463 Nikko 8 views

a new super express is running in Nikko

Tobu railway super express "SPACIA X" in Nikko city and more.

*"SPACIA X" is a new super express operated by Tobu railway.It's popularity, so all received seat completely booked when I took it.

Archive;series 8 views No.460~

No.463　日光八景

日光を走る-東武スペーシアX

アーカイブ:八景シリーズ　No.460～

[cantobear]

咚咚锵!

[leylinefount]

[pain-tool-sai]

some watercolor dilucs ive drawn recently

[brownie-pics]

'24.10.26 若宮神社、春日大社にて

曇り空の早朝、真っ暗な禰宜道抜けて若宮さんから春日さんへ。

常夜灯や水銀灯に照らされた木々や燈籠の影が、独特の雰囲気で気になります。春日さんもまだ開門前。やや青く、薄墨をかけたような空気の時間を経て、辺りは明るくなってきました。

･･晴れそうにはないし、今日はどこを周ろうかと思いつつ撮り歩きます。

[gon-iii]

冬空の彩

2008年、明治神宮外苑いちょう並木。

冬の空にイチョウの色が広がる。

[cactuswastaken]

Live footage of me Gaming *ehem*

It's never going to get old, I am sorry 😔

Hehe well anywayssss on the occasion of the boy's release here is some fanart!

[attractive-curves3]

寒中禊 - 神田明神, 千代田, 東京 Kanchū Misogi/Winter purification ceremony - Kanda Myōjin Shrine, Chiyoda, Tōkyō

[unu-nunu-art]

I doodled new best Liyue boi Gaming 🏮

[merpmonde]

Sangaku Saturday #4

In the previous info post, we went over the debate on the religious aspect of sangaku, and the fact that the absence of prayers on these tablets was more puzzling to some than the mathematics. As such, the tablets are not ema prayer tablets, but donations, which usually don't feature prayers on them. Case in point, some consecrated sake and French wine seen at Meiji-jingû in 2016.

Beyond wishing for good fortune and health, such donations serve two very worldly purposes: to contribute to the life and prestige of the shrine or temple (having a famous contributor makes the shrine famous by association), and to advertise the donor in return, as their name is on display. See this large torii at Fushimi Inari Taisha paid for by TV Asahi (テレビ朝日).

With that in mind, Meijizen's cynical comment from 1673 that sangaku aim "to celebrate the mathematical genius of their authors" may not far from the truth. The authors of sangaku are looking to gain notoriety through the publicity that the shrine or temple provides. But was the bemused Meijizen the target audience?

More on that in a couple of weeks. Below the cut is the solution to last week's problem.

The solution to the first problem (below the cut in this post) is the key. Name K, L and M the intersections of the three circles with the horizontal line. Then, by using that previous result,

Indeed, as in that problem, we can construct three right triangles, ABH, ACI and BCJ and apply Pythagoras's theorem in each.

Now, it suffices to note that KL = KM + LM, so

or, dividing by 2*squareroot(pqr), we get the desired result:

Inverting and squaring this yields the formula for r:

This gives us the means to construct this figure on paper using a compass and a marked ruler. Having chosen two radii p and q and constructed the two large circles (remember that AB=p+q) and a line tangent to both, placing M and C is done after calculating the lengths IK=CM=r and IC=KM=2*sqrt(pr).

[nagaino]

[yurokiku]

guys i love ga ming so muchhh 🥺💖

[sharowolet]

Him...

[ID: digital drawing of chibi gaming (the genshin character). He is holding a cabbage for you. You should take it.]

[pain-tool-sai]

grape harvest 🍇

[koch-snowflake-blog]

神谷 明采は、日本のタレント、会社経営者、YouTuberである。 ウィキペディア

生まれ： 2000年4月19日 (年齢 24歳), 埼玉県

学歴： 東京大学

身長： 161 cm

職業： 株式会社SASA代表取締役、タレント、YouTuber

出身校： 東京大学経済学部経済学科

国籍： 日本