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keisanHigh-precision calculations for everyday life and work

Rokuyō Calculation

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Converts the current Gregorian date to the lunar calendar and calculates the Rokuyō.
Year
Month
Day
Lunar Calendar     
Input in the Japanese calendar is available starting from the year Meiji 6, month 1, and day 1, following the adoption of the Gregorian calendar.
This library performs calculations based on celestial mechanics; therefore, the results may differ from officially designated dates.
For the period from 1870 to 2072, data consistency has been verified against the *Shin Koyomi Benricho* and the *Rekijitsu Taikan*.
The year 1947 uses an intercalary second month. (“New Calendar Handbook” uses an intercalary second month, while “Compendium of Calendar Days” uses an intercalary third month.)

References)
Calculations of Sunrise and Sunset by Kō Nagasawa (Author), Jijin-sha (Publisher)
New Calendar Handbook, edited by the Calendar Calculation Research Society, Koseisha Koseikaku
Comprehensive Calendar Reference, edited and authored by Yūsō Nishizawa, Shin Jinbutsu Oraisha

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