The Infinite Zenith

Where insights on anime, games, academia and life dare to converge

Yuyushiki and Zeller’s Congruence: A midseason discussion

“Quick! In the Head Museum! It’s free on Tuesdays!” -Bender, Space Pilot 3000

December 31, 2999 is in fact a Tuesday, and the use of Zeller’s Congruence can be used to verify this claim. Zeller’s Congruence is also seen in Yuyushiki: we’re now past the halfway point in the anime, so it makes sense to consider what I feel about this show after six episodes. Thus far, we’ve seen Yui, Yukari and Yuzoko partake in traditional summer events, recall their childhoods, talk about whales and potatoes, enjoy nabe with Yoriko Matsumoto, their teacher and even watch as Yui goes on a sleep-deprived rampage after she spends an entire night reading a book.

  • Yuyushki is considered to have countless similarities to Lucky Star, and admittedly, the unusual character designs, paired with the premise of information processing, led me to pick up the show, despite it not being in my list of things to watch initially. Of course, I now have more shows to watch than there are seconds on the clock, but the relatively few anime that interest me from the summer offerings might permit me to catch up.

  • Someone’s probably going to have my head for posting this image, but Yuzuko’s daydream was too amusing to pass up.

  • I watched the first episode way back in in May, a little more than a month ago and noted that their computer screens are probably of the 21 or 23 inch 1080p type. Had I watched this anime back in April, I might’ve been a little envious: ever since January, I found myself wishing that I had a widescreen monitor, which would have helped me write papers more efficiently (on Windows 7 and 8, the snap feature allows windows to be viewed side-by-side), but I only picked up new hardware, well, you guessed it, after finishing my thesis.

  • Chiho Aikawa is a classmate of the girls and the class president. She is a quiet girl who admires Yui a lot and wants to become friends with her, but is usually intimidated by Yuzuko and Yukari’s antics.

  • Nope, not going to deal with these n00bs today, telegraphs Yui, who is seen here hiding behind a workbook of some sort.

  • Fanservice is pretty limited in this anime, but there is a fair portion of episode two dedicated to talking about…well, I’m not going to go there.

  • Insofar, Yuyushiki has been less about data processing and more about the outrageous antics the girls partake in in their day-to-day lives. Slice-of-life anime are enjoyable (for me) because they remind me of my high school days, and also because believe it or not, university has been a similarly unique experience.

  • Yuyushiki carries over the unique characterisation style from Lucky Star and the girls-love overtones from Yuru Yuri. There are also more comical, random elements that find themselves at home in Nichijou.

  • Yui’s sleep-deprived state is immensely amusing to watch. I’ve spent a handful of days in a partially awake state, usually as a result of not sleeping well and developing a headache. To reduce its impacts, I carry Advil in my office to prevent myself from being too heavily affected from coding.

At the near-exact halfway point of the anime, Zeller’s Congruence is discussed as a means of determining the day of week. Upon hitting their equivalent of Wikipedia, Yuzuko and the others find the mathematical expressions for both the Gregorian and Julian calendars, although they are unable to understand how the equation itself operates. Carrying out the calculation itself turns out to be a relatively simple matter, requiring only a basic understanding the floor operation. The expression itself consists of simple operations, as well as a handful of floor operators and the modulo operator: the former simply means “round to the lowest integer” (e.g. the floor of 1.9 and 1.3 is 1), and the modulo operator finds the remainder in a division operation (e.g. 15 mod 7 is 1). Thus, let’s give the Zeller’s Congruence a spin for December 31, 2999. I will ignore the software implementation for this example, and assume that we are using the Gregorian Calendar. For h as the day of week (0 = Saturday, 1 = Sunday, 2 = Monday, etc.), q as the day of month, m as the month, K as the year of the century and J as the century. Then:

Thus, using Zeller’s Congruence, we have demonstrated that December 31, 2999, will indeed be a Tuesday. Similarly, the equation yield h = 4 when asked for the day of week for January 1, 2020 (by the same methodologies above, although we use m = 13, k = 19 and J = 20 owing to special parameters used in the algorithm). This corresponds to a Wednesday, as expected. Unlike Yuzuko, I have some background in mathematics, so wielding this equation is not particularly problematic. After watching Yuyushiki and pursuing Wikipedia, some Tropers have come across the same page, which tells them that Zeller’s Congruence is for determining the day of week of any date on a Gregorian or Julian Calendar, although much of TVTropes’ user base will run into the same problem Yuzuko did, lacking the mathematical background required to wield the equation.

  • On a typical day, I only have hot food during dinner, making it especially delicious. For the sake of inconvenience and efficiency, I prefer eating things that are quick in the mornings and during lunch; this is not to say they don’t taste good.

  • I was originally wondering how I would go and add figure captions for all twenty of the screenshots, but I realised that I could probably talk about random stuff that (somewhat) pertains to the images the caption is supposed to accompany.

  • Apparently, human interest in cute things is an evolutionary characteristic: our attraction to cute things, such as infants and children, arose from selection choosing for individuals who were more interested in taking care of small children and infants. Because parents who took more care of their offspring were more likely to pass on there genes, this behaviour would eventually have a higher proportion in a population and as such, modern society values cuteness.

  • I remember this one time, I was watching a game of Street Fighter II and began laughing so hard, I was crying. The damage mechanics, coupled with unique sounds in Street Fighter II make a handful of unique jokes. I also recall laughing myself silly over some of the stuff that happens in Pure Pwnage (most notably, FPS_Doug’s antics and Jeremy’s tendency to pelvic thrust his CRT screen upon a victory). Laughing to the point of tears is supposed to be healthy in moderation.

  • Admit it, the English version on Wikipedia of the Zeller’s Congruence is significantly easier to read. I’ve provided an example of how it works above: the equation is probably beyond the scope of materials that most high schools cover, but university students should feel right at home with the floor and ceiling operators.

  • Yui resorts to her fists to keep Yuzuko in check after the latter tries to blackmail Yoriko into letting them have hotpot on campus in their clubroom.

  • This is the first time I’ve seen crab meat in nabe: nabe differs from Chinese hotpot in that all of the ingredients are mixed together and cooked all at once, while the versions I’m used to involve cooking the meat first, followed by seafood and vegetables, and the noodles last, resulting in the flavour from everything put in previously to imbue with all of their flavours.

  • Voiced by Minami Tsuda, Yui behaves in a very similar manner to Yui Funami from Yuru Yuri. Yuzuko, on the other hand, is voiced by Rumi Oubuko, who also played Chinatsu Yoshikawa from Yuru Yuri. Unlike Chinatsu, Yuzuko’s innocent nature does not belie a more evil side.

  • In anime, the cameras are almost always “conveniently” placed for the viewer’s amusement, except maybe mine, especially since I choose my titles very carefully to avoid this stuff, and thus, are usually found watching anime in the presence of others, who don’t particularly mind my hobby. However, when this stuff shows up, people start asking questions.

  • I’d never thought I’d actually be able to generate figure captions for this many images, but here you go.

Insofar, Yuyushiki has turned out to be a remarkably simple anime that is more minimalist than even Lucky Star in the way of story, focusing almost entirely on the girls’ daily lives. What sets Yuyushiki apart from other anime of this class would be its unique integration of data processing into the mix, making it fun to see what the girls will look up and summarise next. From a practical perspective, the girls are really getting nothing of value done (their club activities are essentially equivalent to looking up various topics on Wikipedia), but this aspect is forgiven owing to how well it interfaces with the girls’ unique personalities, making the anime a light-hearted alternative to the more focused series that this season has to offer. I note that I am following Suisei no Gargantia, Yahari ore no Seishun Love Come wa Machigatteiru and Ore no Imouto ga konna ni Kawaii Wake ga nai (second season) at the present and will discuss those in greater detail, hopefully before June ends.

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