The World Calendar treats Worldsday and Leapyear Day as a 24-hour waiting period before resuming the calendar again. These off-calendar days, also known as "intercalary days", are not assigned weekday designations. They are intended to be treated as holidays.

The World Calendar has its roots in the proposed calendar of the Abbot Marco Mastrofini, a proposal to reform the Gregorian calendar year so that it would always begin on Sunday, 1 January, and would contain equal quarters of 91 days each. The 365th day of the solar cycle would be a year-end, "intercalary" and optionally holiday. In leap years, a second "intercalary day" follows Saturday, 30 June.


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Elisabeth Achelis founded The World Calendar Association (TWCA) in 1930 with the goal of worldwide adoption of the World Calendar. It functioned for most of the next twenty-five years as The World Calendar Association, Inc. Throughout the 1930s, support for the concept grew in the League of Nations,[2] the precursor of the United Nations. Achelis started the Journal of Calendar Reform in 1931, publishing it for twenty-five years,[3] and wrote five books[4] on the calendar concept.

Following World War II, Achelis solicited worldwide support for the World Calendar. As the movement gained international appeal with legislation introduced in the United States Congress, awaiting international decisions, Achelis accepted advice that the United Nations was the proper body to act on calendar reform. At the United Nations in 1955, the United States significantly delayed universal adoption by withholding support "unless such a reform were favoured by a substantial majority of the citizens of the United States acting through their representatives in the Congress of the United States." Also, Achelis wrote in 1955 (JCR Vol. 25, page 169), "While Affiliates and Committees have over the years and still are able to approach all branches of their governments, the Incorporated (International) Association was prevented from seeking legislation in the United States lest it lose its tax exempt status. Because of this I have been prevented from doing in my own country that which I have been urging all other Affiliates to do in theirs."

Proponents refer to its simple structure. Each day is assigned an exact, repetitive date relative to week and month. Quarterly statistics are easier to compare, since the four-quarters are the same length each year. Economic savings occur from less need to print calendars because only the year number changes. Work and school schedules do not need to unnecessarily reinvent themselves, at great expense, year after year. The World Calendar can be memorised by anyone and used similarly to a clock.

Supporters of the World Calendar do not deny that their system is at odds with the traditions of a significant portion of the world's population, but argue that Worldsdays and Leapyear Days can be treated as "double" holidays by those who wish to maintain the seven-day week sequence.[citation needed]

The World Calendar, unlike some other proposals, is not compatible with the international standard ISO 8601, which is based upon, but differs from, the Gregorian calendar. They differ regarding the first weekday of the week (Sunday vs. Monday), and ISO 8601 does not support intercalary dates (e.g. in notation). The World Calendar, however, modifies the Gregorian calendar less than other calendar reform proposals to achieve the sought after improvements of a simpler and perpetual calendar.

Technically, our Gregorian calendar is a variously orderd cycle of 14 calendars. Thecalendar for the year beginning on Sunday differs from the one for the year beginning onMonday, and so on for all seven weekdays. Since the occurrence of leap year can alter anyof these seven calendars, this raises the total to 14 calendars.

That's the mess the 365th day causes. If we took that day out of the calendar, the newyear would typically begin on the very same weekday as the previous year. And if welikewise took leap day out of the calendar, the new year would always begin on the sameweekday. We'd thus have a perennial calendar.

We can take a day out of the calendar without deviating from the solar cycle ofapproximately 365.24 days by simply regarding the day as a 24-hour waiting period beforeresuming the calendar again. These off-calendar days, also known as "blank days"or "intercalary days," won't be weekdays. It seems most reasonable to treat themas holidays.

That's part of the rationale behind The World Calendar, promoted by The World Calendar Association from 1930. Its perennialityhas obvious benefits for scheduling and planning; and The World Calendar has other advantages over the Gregorian calendar too.

Photographs are selected by the ESA Committee on the Insect Calendar and must be of the highest aesthetic and technical quality. A call for photos is announced early in the year for the following year's calendar, which is published each year in November.

2024 World of Insects Calendar: Order Now 


For the 2024 calendar, more than 729 photo entries were submitted from more than 180 photographers from around the globe. The 2024 cover photo features an elm zigzag sawfly Aproceros leucopoda, by Christian Brockes, Essen, North Rhine-Westfalia, Germany. 


The 2024 World of Insects Calendar is available for purchase online. All proceeds from sales of the World of Insects Calendar directly benefit ESA's Chrysalis Fund, which fosters the future of entomology through grants for programs that teach kids about insect science. Learn more about the Chrysalis Fund. 


The ESA Committee on the World of Insects Calendar will evaluate photos for their aesthetic and technical quality, and images for the 2024 calendar will be chosen in July 2024. All winning and non-winning entrants will be notified of the results in mid-July.

This facility is truly world class. As a vendor that travels to some of the nicest horse facilities in the USA, this place is unequaled. WEC offers the finest in all aspects of horse showing, with wonderful amenities for the horse, rider and vendor. The Harris family is so grateful for the opportunity to attend shows here at WEC. The staff is amazing and they are always ready and willing to do whatever it takes to make our setup smooth and uneventful.

A worldwide cardiac pacing and implantable cardioverter-defibrillator (ICD) survey was undertaken for calendar year 2009 and compared to a similar survey conducted in 2005. There were contributions from 61 countries: 25 from Europe, 20 from the Asia Pacific region, seven from the Middle East and Africa, and nine from the Americas. The 2009 survey involved 1,002,664 pacemakers, with 737,840 new implants and 264,824 replacements. The United States of America (USA) had the largest number of cardiac pacemaker implants (225,567) and Germany the highest new implants per million population (927). Virtually all countries showed increases in implant numbers over the 4 years between surveys. High-degree atrioventricular block and sick sinus syndrome remain the major indications for implantation of a cardiac pacemaker. There remains a high percentage of VVI(R) pacing in the developing countries, although compared to the 2005 survey, virtually all countries had increased the percentage of DDDR implants. Pacing leads were predominantly transvenous, bipolar, and active fixation. The survey also involved 328,027 ICDs, with 222,407 new implants and 105,620 replacements. Virtually all countries surveyed showed a significant rise in the use of ICDs with the largest implanter being the USA (133,262) with 434 new implants per million population. This was the largest pacing and ICD survey ever performed, because of mainly a group of loyal enthusiastic survey coordinators. It encompasses more than 80% of all the pacemakers and ICDs implanted worldwide during 2009.

The Nikon Small World 2024 Calendar is printed in full color on semi-gloss paper and spiral bound for mounting on the wall. Included in the calendar are all of the winning images from the 2023 Photomicrography Competition. Order your calendar today and we'll send you a second one at no cost! We'll also include a free lens cleaning cloth.

The action will get under way on 13-14 April at Maisse in France, a venue last used in 2008 when reigning TrialGP champion Toni Bou (Montesa) finished as runner-up on the way to his second world crown, with one day of competition scheduled. 006ab0faaa

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