Comparison of Solar Perpetual Calendars

COMPARISON OF PROPOSED SOLAR PERPETUAL CALENDARS

Aristeo Fernando initially presented a comparison between the Aristean calendar and Henry's Calendar & Time Plan in the calendar discussion list, CALNDR-L, on 24 January 2005. Karl Palmen added seven other proposed solar perpetual calendars in the comparison on 25 January 2005. Below is what Mr Palmen presented which Mr Fernando tabulated and grouped into three kinds (with some minor changes):

28 days per month - International Fixed Calendar (IFC), Colligan's Pax Calendar (Pax), and Raventos Symmetrical Calendar (Rav).
30 & 31-days quarters - Henry's Calendar & Time Plan (C&T), Bob McClennon's Reformed Weekly Calendar (RWC), World Calendar (WC), and Aristean Calendar.
28 & 35-days quarters - Bonavian Civil Calendar (BCC) and Symmetry 454 Calendar (454).

	IFC	Pax	Rav	C&T	RWC	WC	Aristean	BCC	454
Days in each quarter	3 1/4 months of 28 days	3 1/4 months of 28 days	3 1/4 months of 28 days	30-30-31	31-30-30	31-30-30	31-30-30	35-28-28	28-35-28
Week begins	Sunday	Sunday	Monday	Sunday	Undecided	Sunday	Monday	Sunday	Monday
Monthless and dateless days	Uncertain	None	None	None	None	One per year + leap day	None	None	None
Mini-month (also intercalary month)	None	Yes (Pax with seven days)	None	Yes (Newton with seven days)	Yes (Leap Week)	None	None	None	None
Days in common year	365	364	365	364	364	365	365	364	364
Days in Leap Year	366	371	366	371	371	366	366	371	371
Leap Year	As Gregorian	Years ending in 06, 12, every six years to 96 then 99 and also 00 unless divisible by 400	As Gregorian	Years with 53 Thursdays in Gregorian Calendar as listed in a table	Every 5 years with exceptions	As Gregorian	As Gregorian	Five years every 28 years with one exception every 896 years	Either years with 53 Thursdays in Gregorian Calendar or an astrono-mical rule
Leap Days	June 29 or day between June and New Month (Sol or Midi)	Pax 1-7	December 30	Newton 1-7	Leap Week 1-7	Between June 30 and July 1	June 31	December 29-35	December 29-35
Leap Day (s) at end of year	No	No	Yes	No	Yes	No	No	Yes	Yes
Months (all have months January to December	13 including month of Sol or Midi between June and July	13 including Columbus between November and December + Pax in leap years	13 including Vacance between July and August	12 + the mini-month every leap year	12 + leap week	12	12	12	12
Deleted dates from Gregorian calendar	29^th, 30^th, and 31^st days of months	29^th, 30^th, and 31^st days of months	29^th, 30^th, and 31^st days of months	Jan 31, May 31, Jul 31, Aug 31, Oct 31 (5 dates)	Mar 31, May 31, Aug 31, Dec 31 (4 dates)	Mar 31, May 31, Aug 31, Dec 31 (4 dates)	Mar 31, May 31, Aug 31 (3 dates)	29^th, 30^th, and 31^st days of Feb, Mar, May, Jun, Aug, Sep, Nov, and Dec	29^th, 30^th, and 31^st days of Jan, Mar, Apr, Jun, Jul, Sep, Oct, and Dec
Friday the 13^th	In all 13 months	In all 13 months	None	In four months (Jan 13, Apr 13, Jul 13, and Oct 13)	Four months or none	In four months (Jan 13, Apr 13, Jul 13, and Oct 13)	None	In all 13 months	None
Days outside of 7-day week	Leap Day and New Year's Eve	None - 7-day week uninter-rupted	December 29 and Leap Day (December 30)	None - 7-day week uninter-rupted	None - 7-day week uninter-rupted	Leap Day and New Year's Eve	Leap Day and New Year's Eve	None - 7-day week uninter-rupted	None - 7-day week uninter-rupted
Calendar weeks that agree with current 7-day week	About 1 in 7 weeks	All weeks	About 1 in 7 weeks	All weeks	All weeks	About 1 in 7 weeks	About 1 in 7 weeks	All weeks	All weeks
All months begin on same day of week	Yes	Yes	Yes	No	No	No	No	Yes	Yes
Approxi-mate variation of new year against seasons	2 days	2 to 3 weeks	2 days	1 week	2 to 3 weeks	2 days	2 days	2 weeks	1 week
Every month but one the same each year	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes

The URLs of these calendar proposals are:

IFC - http://personal.ecu.edu/mccarty/eastman.html

Pax - http://personal.ecu.edu/mccartyr/colligan.html

Rav - No working URL (unless you know otherwise)

C&T - http://henry.pha.jhu.edu/calendarDir/calendar.reform.html

RWC - http://www.go2zero.com/rwc/rwc.html

WC - http://personal.ecu.edu/mccartyr/world-calendar.html

Aristean - http://www.geocities.com/peacecrusader888/calendaridx.htm

BCC - http://personal.ecu.edu/mccartyr/bonavian.html

454 - http://individual.utoronto.ca/kalendis/symmetry.htm

File: comparesolar.htm - Last updated: 2005 February 8

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