Magnetic Calendar

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    2011 Magnetic Calendar

    2011 CALENDARS
    Special Offer - Early Bird Pricing On all calendar magnets on this page, take 10% off regular prices and free shipping for all orders placed before November 10, 2009. Click below for details. Click for Special Discount Prices
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    We have the inexpensive 2010 Magnetic Calendars. 2010 Magnetic Calendar, 2011 Magnetic Calendar, Magnetic Calendar Calendars are cheap advertising all year long for real estate, business, school, and churches.
    A full calendar system has a different calendar date for every day. Thus the week cycle is by itself not a full calendar system; neither is a system to name the days within a year without a system for identifying the years.

    The simplest calendar system just counts time periods from a reference date. This applies for the Julian day. Virtually the only possible variation is using a different reference date, in particular one less distant in the past to make the numbers smaller. Computations in these systems are just a matter of addition and subtraction.

    Other calendars have one (or multiple) larger units of time. Calendars that contain one level of cycles:

    week and weekday this system (without year, the week number keeps on increasing) is not very common year and ordinal date within the year, e.g. the ISO 8601 ordinal date system Calendars with two levels of cycles:

    year, month, and day most systems, including the Gregorian calendar (and its very similar predecessor, the Julian calendar), the Islamic calendar, and the Hebrew calendar year, week, and weekday e.g. the ISO week date Cycles can be synchronized with periodic phenomena:

    An astronomical calendar is based on ongoing observation; examples are the religious Islamic calendar and the old religious Jewish calendar in the time of the Second Temple. Such a calendar is also referred to as an observation-based calendar. The advantage of such a calendar is that it is perfectly and perpetually accurate. The disadvantage is that working out when a particular date would occur is difficult.

    An arithmetic calendar is one that is based on a strict set of rules; an example is the current Jewish calendar. Such a calendar is also referred to as a rule-based calendar. The advantage of such a calendar is the ease of calculating when a particular date occurs. The disadvantage is imperfect accuracy. Furthermore, even if the calendar is very accurate, its accuracy diminishes slowly over time, owing to changes in Earth's rotation. This limits the lifetime of an accurate arithmetic calendar to a few thousand years. After then, the rules would need to be modified from observations made since the invention of the calendar. This information can be displayed on a magnetic calendar.
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    Magnetic Calendar History Lesson:

    Many calendars incorporate simpler calendars as elements. For example, the rules of the Hebrew calendar depend on the seven-day week cycle (a very simple calendar), so the week is one of the cycles of the Hebrew calendar. It is also common to operate two calendars simultaneously, usually providing unrelated cycles, and the result may also be considered a more complex calendar. For example, the Gregorian calendar has no inherent dependence on the seven-day week, but in Western society the two are used together, and calendar tools indicate both the Gregorian date and the day of week.[2]

    The week cycle is shared by various calendar systems (although the significance of special days such as Friday, Saturday, and Sunday varies). Systems of leap days usually do not affect the week cycle. The week cycle was not even interrupted when 10, 11, 12, or 13 dates were skipped when the Julian calendar was replaced by the Gregorian calendar by various countries.

    The above is provided as a public service of the 2009 magnetic calendar printer. is neither affiliated with the authors of this page nor responsible for its contents. This is a safe-cache copy of the original web site.