TIL until 1873, the Japanese divided each day into 12 unequal hours. Daylight and darkness were each split into six equal parts regardless of the season; daylight hours grew longer in summer and shorter in winter, with the reverse occurring for nighttime hours.

Read more: https://physicstoday.scitation.org/doi/full/10.1063/PT.3.4229

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  1. This sounds very similar to the old celtic calendar, only the day was seen as starting at sunset. The year was also cut into two seasons, it started on Samhain with the season of the dark, and then the season of the light began on Beltaine.

  2. > Incense clocks, a type of fire clock widely used in the Tokugawa period, had moveable hour markers placed in the sand alongside a trail of burning incense and required a standardized system for shifting the hour markers as the year progressed. *The lengths of day and night hours were adjusted 24 times a year according to seasonal weather changes.*

    Daylight savings time nervously smoking on the sidelines.

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