Perpetual calendar

Details Perpetual calendar Perpetual calendar

1988-03-11

1989-03-21

Bell, Paul A.

B42D 1500

Patent

active

048137073

ABSTRACT:
A perpetual calendar comprising a plurality of tables containing basic data for the determination of the day of the week for dates of the Gregorian, Julian, Islamic, Zodiacal and Coptic calendars using minimal calculations and notes and being applicable essentially limitless.

REFERENCES:
patent: 458970 (1891-09-01), Fitch
patent: 505901 (1893-10-01), Hoyt
patent: 773669 (1904-11-01), O'Shaugnessy
patent: 789166 (1905-05-01), Manfred
patent: 1016370 (1912-02-01), Singh
patent: 1153926 (1915-09-01), Johnston
patent: 1374532 (1921-04-01), Spillman
patent: 1608411 (1926-11-01), Mateju
patent: 2768459 (1956-10-01), Corbett
patent: 4251935 (1981-02-01), Wright
patent: 4285148 (1981-08-01), Kolar

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