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keisanHigh-precision calculations for everyday life and work

Traditional Japanese Seasonal Observances

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Calculates the miscellaneous seasonal observances for the year (Doyō, Setsubun, Higan, Shajitsu, Hachijuhachiya, the start of the rainy season, Hangeshō, and Nihyakutōka).
Year
This library performs calculations based on celestial mechanics, so the results may differ from actual historically recorded dates.
The data for the period from 1950 to 2050 has been verified for consistency with *The New Calendar Handbook*.

References)
*The New Calendar Handbook*, edited by the Calendar Calculation Research Group, Koseisha Koseikaku

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