It is a purely solar calendar, with a cycle of leap days in a year cycle designed to keep the duration of the year aligned with the solar year.
And, although the schools may accommodate more people, parents now have to worry about, and pay for, air conditioning in the summer.
McGlynn, Ann. And there are other issues that may hold back this system from being implemented. In a paper calendar one or two sheets can show a single day, a week, a month, or a year. Gregorian calendar[ edit ] The Gregorian calendar is the de facto international standard, and is used almost everywhere in the world for civil purposes.
An example is the Islamic calendar. This type of school calendar is becoming out of date because of a decline in farming societies and changing lifestyles. Teachers and administrators benefit from many of the same things that students do, so according to Michael Ward and Philip Kirk, they too experience higher moral and a better overall experience.
Multitracks are mostly beneficial to schools that lack seating capacity and resources for students, allowing them to take on more students than they may be actually able to accommodate.
Similarly, Michael Rappenglueck believes that marks on a 15,year-old cave painting represent a lunar calendar.