Welcome to Sym454.org ...

Bookmark or cite this page as <http://www.sym454.org>

Created by Dr. Irv Bromberg, University of Toronto, Canada

Menu (click on desired choice):

1. The Symmetry454 Calendar or the Symmetry010 Calendar
   • simple perpetual solar leap week calendars
   • conserve the traditional 7-day week
   • have symmetrical equal quarters
   • start every quarter on the same weekday (every month for Symmetry454)
   • symmetrically distribute leap years at intervals that are as smoothly spread as possible
2. The Kalendis Calendar Calculator ( Free ) new version 9.740(1460)
3. Why March 21st?
4. The Lengths of the Seasons
5. The Length of the Lunar Cycle
6. The Duration of Twilight
7. Solar Calendar Leap Rules
8. The Traditional Hebrew Calendar and the Rectified Hebrew Calendar
9. The Arithmetic of the Bahá'í Calendar, and Variants (Leap Day, Week, or Month)
10. Links to Geographic Name Servers (to set up User-Defined Locales in Kalendis)
11. What's new at this web site?