43/450 Calendar
Month:5 Year:13 Accum:173 |
Sunday | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday |
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If Javascript is enabled on your browser, what you should see is a calendar
of the current month displayed using the 43/450 calendar. I call it the 43/450
calendar, because the calculation for where to place a leap day is based upon an
accumulator.
The zero date has been set to the end date of the Mayan
long count, which corresponds to the winter solstice that occurs when the sun
travels through the intersection of the ecliptic and the Milky Way. In the
Gregorian calendar, this date is December 21, 2012.
Years prior to this year are negative. If you have trouble thinking of
negative years, think of B.C. (except that there is a year zero). Negative years here are analogous to years B.C.
But in this case, we are living B.C. until the year 2012 (Gregorian).
Each month has an associated accumulator. This accumulator is incremented by
43 each month. If the number equals or exceeds 450 in a given month, an extra
day is added to the month. Also, the accumulator is decremented by 450.
In this way, a leap day is added every 10 or 11
months.
This month's accumulator is
173
so next month's accumulator is (
173 + 43) mod 450 = 216
.
The color of each table cell is determined by the Gregorian date. So the
color gradually changes with each day (green component) and has a jump each
month (red component). There is another jump at the end of the Gregorian year
(blue component). The color cycle repeats after 100 years. In order to maintain
readability, only light colors are used. The red cell is today's date.
There are numerous advantages to this calendar. For now, I will leave it to
you to search forother websites on 13 month 28 day calendars to see the
advantages of that scheme. All theadvantages of such calendars also apply to
this one. The leap day scheme is where this calendaris unique. The main
advantage is accuracy. This calendar is more consistent and accurate thanthe
gregorian calendar. I've created a chart showing the error overtime in
the two calendars. Graphed are the summer solstice (blue:gregorian --
red:43/450) and the winter solstice (green:gregorian -- purple:43/450).
Below are last month's and next month's calendars.
Month:4 Year:13 Accum:130 | Sunday | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday |
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Month:6 Year:13 Accum:216 | Sunday | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday |
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Would you like to see what the calendar looks like on a given date? Use the
left form to enter a date, and the 43/450 month containing that date will be
rendered for you in a separate window. Use the right form to enter a date, and
thirteen months starting with the date you entered will be rendered for you in a
separate window. Note that currently this will work only for dates up to
12/21/2012.
Copyright © 2000 Victor S. Engel
All rights reserved.