A few autumn-winter periods have two or three calendar months in which the sun stays within one sign during the month ( i. e. months that would normally be treated as intercalary months ), interspersed with one or two calendar months in which the sun enters two signs of the zodiac during the month, something that was impossible using mean sun motion.

In Western Christianity, using the Gregorian calendar, Easter always falls on a Sunday between 22 March and 25 April, inclusively.

The original form of this calendar would have determined Easter using precise astronomical calculations based on the meridian of Jerusalem.

The Hebrew numerals are used only in special cases, such as when using the Hebrew calendar, or numbering a list ( similar to a, b, c, d, etc.

The addition of the leap month ( Adar II ) is determined by observing in Israel the ripening of barley at a specific stage ( defined by Karaite tradition ) ( called aviv ), rather than using the calculated and fixed calendar of Rabbinic Judaism.

Occasionally this results in Karaites being one month ahead of other Jews using the calculated Rabbinic calendar.

Whether to insert an intercalary month in a given year may be determined using regular cycles such as the 19-year Metonic cycle ( Hebrew calendar and in the determination of Easter ) or using calculations of lunar phases ( Hindu lunisolar and Chinese calendars ).

It is sometimes celebrated as New Year's Eve ( at least in the 20th & 21st centuries ) by countries and organisations still using the thirteen-days-adrift Julian calendar ( Old New Year ).

Apple iOS devices, like the iPhone, iPod Touch, and iPad, can use Apple's MobileMe subscription service to synchronize calendar, address book, mail account, Internet bookmark, and other data with one or more Macintosh or Windows computers using Wi-Fi or cellular data connections.

In Celtic nations such as Ireland ( using the Irish calendar ) and in Scandinavia, the winter solstice is traditionally considered as midwinter, with the winter season beginning 1 November, on All Hallows, or Samhain.

The Persian calendar, in use in Afghanistan and Iran, has its year begin on the day of the vernal equinox as determined by astronomical computation ( for the time zone of Tehran ), as opposed to using an algorithmic system of leap years.

A calendar era is used to assign a number to individual years, using a reference point in the past as the beginning of the era.

Other countries continued using the Julian calendar, switching calendars in later years, and the complete conversion of the Gregorian calendar was not entirely done until 1929.

* The calculation of the Chinese calendar begins to use true motions of the sun and moon modeled using two offset opposing parabolas.

Thus there is no simple way to find an equivalent in the proleptic Julian calendar of a date quoted using the Roman pre-Julian calendar ( AUC or by reference to consuls ).

* January 1 Protestant Western Europe ( except England ) starts using the Gregorian calendar

This is the Thai solar calendar using the Thai Buddhist Era.

* In Israel, the traditional Hebrew calendar, using an era dating from Creation, is the official calendar.

The book compresses that time into a single calendar year, using the passage of four seasons to symbolize human development.

The Chinese calendar was also called the " old calendar " ( 舊曆 / 旧历 ) as opposed to the " new calendar " ( 新曆 / 新历 ), i. e., the Gregorian calendar, was adopted as the official calendar.

Although tradition holds that in the Zhou, the year began on the new moon which preceded the winter solstice, the Spring and Autumn Annals seem to indicate that ( in Lu at least ) the Yin calendar ( the calendar used in Shang dynasty, with years beginning on the first new moon after the winter solstice ) was in use until the middle of the 7th century, and that the beginning of the year was shifted back one month around 650 BC.

In 256 BC, as the last Zhou king ceded his territory to Qin, a new calendar ( the Qin calendar ) began to be used.

It followed the same principles as the Sifen calendar, except the year began one month before ( the second new moon before the winter solstice, which now fell in the second month of the year ).

The French Revolution was a time of upheaval, especially towards traditional ideology, in almost every sense: the current monarch, King Louis XVI, was executed ; the Catholic Church was all but abolished ; a new calendar was created ; and a new Republican government was established.

The new system was designed in part to remove all religious and royalist influences from the calendar, and was part of a larger attempt at decimalisation in France.

The new Republican government sought to institute, among other reforms, a new social and legal system, a new system of weights and measures ( which became the metric system ), and a new calendar.

The new calendar was created by a commission under the direction of the politician Charles Gilbert Romme seconded by Claude Joseph Ferry and Charles-François Dupuis.

As the rapporteur of the commission, Charles-Gilbert Romme presented the new calendar to the Jacobin-controlled National Convention on 23 September 1793, which adopted it on 24 October 1793 and also extended it proleptically to its epoch of 22 September 1792.

The Republican calendar year began at the Southward equinox and had twelve months of 30 days each, which were given new names based on nature, principally having to do with the prevailing weather in and around Paris.

In fact the Jewish calendar has a multiplicity of new years for different purposes.

The haphazard fiscal year calendar is an obstacle to the planning of clear and efficient state-local revenue and expenditure relationships.

Twelve cities and towns in Rhode Island presently indicate some plans to establish a uniform and/or coordinated fiscal tax year calendar.

The adjustments needed to establish a uniform and coordinated fiscal tax collection year calendar throughout Rhode Island, based on a July 1 to June 30 year, are shown below.

This change will automatically adjust their tax collection year calendar so as to make all tax installments due and payable in the fiscal year collectible within that year.

Six cities and towns are now on a July 1 to June 30 fiscal year and will need only to adjust their tax collection year calendar to establish uniformity.

The maximum amount of payments which may be made pursuant to this Act on account of sales of newly mined ores or concentrates produced therefrom made during the calendar year 1962 shall not exceed $4,500,000 ; ;

the maximum amount of such payments which may be made on account of such sales made during the calendar year 1963 shall not exceed $4,500,000 ; ;

the maximum amount of such payments which may be made on account of such sales made during the calendar year 1964 shall not exceed $4,000,000 ; ;

and the maximum amount of such payments which may be made on account of such sales made during the calendar year 1965 shall not exceed $3,500,000.

The first Atlas ICBM's are now operational, the first two Polaris submarines are expected to be operational this calendar year, and the first Titan ICBM's next year.

April 15 is usually the final date for filing income tax returns for most people because they use the calendar year ending on December 31.

Since April 15, 1962, is on Sunday your return for the calendar year 1961 will be timely filed if it is filed on or before Monday, April 16, 1962.

If you were required to file a declaration of estimated tax for the calendar year 1961, it is not necessary to pay the fourth installment otherwise due on January 15, 1962, if you file your income tax return Form 1040, and pay your tax in full for the calendar year 1961 by January 31, 1962.

Farmers, for these purposes, have until February 15, 1962, to file Form 1040 and pay the tax in full for the calendar year 1961.

However, if their United States income is not subject to the withholding of tax on wages, their returns are due June 15, 1962, if they use a calendar year, or the 15th day of the 6th month after the close of their fiscal year.

Suppose John Jones, who, for 1960, filed on the basis of a calendar year, died June 20, 1961.