Hanke-Henry Permanent Calendar

The Hanke-Henry Permanent Calendar is a proposal for calendar reform. It is one of many examples of leap week calendars, calendars which maintain synchronization with the solar year by intercalating entire weeks rather than single days. It is a modification of a previous proposal, Common-Civil-Calendar-and-Time. With the Hanke-Henry Permanent Calendar, every calendar date always falls on the same day of the week.

Features

Hanke-Henry Permanent Calendar Proposal

While many calendar reforms aim to make the calendar more accurate, the Hanke-Henry Permanent Calendar focuses on making the calendar perennial, so that every date falls on the same day of the week, year after year.[1] The familiar drift of weekdays with respect to dates results from the fact that the number of days in a physical year (one full orbit of earth around the sun, approximately 365.24 days) is not a multiple of seven. By reducing common years to 364 days (52 weeks), and adding an extra week every five or six years, The Hanke-Henry Permanent Calendar eliminates weekday drift and synchronizes the calendar year with the seasonal change as the Earth circles the Sun. The extra week, or "mini-month", known as "Xtr (or Extra)",[1] occurs every year that either begins or ends in a Thursday on the corresponding Gregorian calendar,[1] and falls between the end of December and the beginning of January. Thus, each year always begins between December 28 and January 3 in the Gregorian calendar.

Under the Hanke-Henry Permanent Calendar January, February, April, May, July, August, October and November have thirty days, while March, June, September, and December have thirty-one, so that each quarter contains two 30 day months followed by one month of 31 days. While the Hanke-Henry Permanent Calendar changes the length of the months, the week and days remain the same.[2] As part of the calendar proposal, time zones would be eliminated and replaced with UTC.

Henry argues that his proposal will succeed where others have failed because it keeps the weekly cycle perfectly intact and therefore respects the Fourth Commandment (Remember the sabbath day, to keep it holy)[3] of Judaism and Christianity. This calendar also urges its own adoption and attempts to convince people it is the best calendar ever proposed. Henry tells supporters of other calendar proposals to support a switch to the C&T.

History

In 2004, Dick Henry, a professor of astronomy at Johns Hopkins University, proposed the adoption of a calendar known as Common-Civil-Calendar-and-Time, which he described as a modification to a proposal by Robert McClenon. This version had essentially the same structure given above, but inserted its leap week named "Newton" between June and July. The leap rule was chosen to match the ISO week leap rule, to minimise the variation in the start of the year relative to the Gregorian calendar.

He had advocated transition to the calendar on 1 January 2006 as that is a year in which his calendar and the Gregorian calendar begin the year on the same day. After that date passed, he recommended dropping off 31 December 2006 to start in 2007, or dropping 30 and 31 December 2007 to start 2008.[4]

In late 2011 the calendar was revised by Johns Hopkins economist Steve Hanke into its current form, by moving the leap week from the middle to the end of the year and renaming it "Xtra", producing the Hanke-Henry Permanent Calendar. The adoption process officially began on 1 January 2012 and the current target date for universal adoption is 1 January 2017, according to the calendar's website.

The key difference between Robert McClenon's calendar proposal and Henry's modification is that it has a simple rule for determining which years have a leap week. This rule resembles the Gregorian leap year rule. Years whose numbers are divisible by 5 have a leap week, but years whose numbers are divisible by 40 do not have a leap week unless also divisible by 400. The main drawback of this rule is that the new year varies 17 days relative to the Gregorian new year (e.g. year 1965 begins 11 days earlier than Gregorian 1965 and year 2036 begins 6 days later than Gregorian 2036), whereas Henry's rule ensures that the new year always begins within four days of the Gregorian new year.

Advantages

Disadvantages

Other calendar reform proposals

References

  1. ↑ 1.0 1.1 1.2 "The Hanke-Henry Date and Time, Everywhere in the World"
  2. ↑ "Is It Time to Overhaul the Calendar?", by Stephanie Pappas, Scientific American.
  3. ↑ The Fourth Commandment at the CCC&T Calendar website.
  4. ↑ "What if We MISS 2006 January 1 Sunday?"
  5. ↑ , GlobeAsia, 2013

External links