Katakana Calendar - Katakana Goyomi

Japanese: 片仮名暦 - かたかなごよみ

…The appearance of the kana calendar made it accessible to the general public, encouraging the rise of calendar makers in various regions and spreading widely. Kana calendars are usually written in hiragana, but in rare cases, there are also katakana calendars. [Masao Uchida]…

From [Calendar]

... At the end of the Heian period, kana calendars written in kana appeared. Although kana calendars are occasionally written in katakana, most are written in hiragana. The oldest existing kana calendar is the one from 1226 (Karoku 2) during the Kamakura period. ...

From the Nanto Calendar

…The main calendar was the fu (Kubari) calendar, but some calendar makers were allowed to sell calendars for the Yamato province only. The katakana calendar is thought to be limited to the Nanto calendar, and another characteristic is that the day of the week was written for each day from the time of the Senmei calendar. [Uchida Masao]. …

*Some of the terminology explanations that refer to the "katakana calendar" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…仮名暦の出現によって暦は一般庶民のものとなり，各地に暦師の勃興を促し広範囲に普及していった。仮名暦はふつうはひらがなであるがまれには片仮名暦もある。【内田正男】。…