The solstice is either of the times when the sun is furthest from the equator.

Summer Solstice is the longest day and Winter the shortest.

The dates can be seen below:

The Calendar was susequently abolished on 1 January 1806 by Emperor Napoleon I, although it was briefly reinstated in 1871.

Although not really relevant to the calendar it might interest somne to know that there was also a proposal for "French Revolutionary Time"

This divided the day into 10 decimal hours with 100 decimal minutes and each minute into 100 decimal seconds.

This was not officially used until September 22, 1794, and was officially suspended April 7, 1795.

All weeks had 5 days, all months had 30 days and the remaining five days of a year were added as holidays in between, not belonging to any month or week.

The intercalary days were designated:

Lenin day after January 30
Labour Days, two days after April 30
Industry Days, two days after November 7
in leap years, a leap day after February 30

The Chinese New Year is determined by the second new moon after the winter solstice. It therefore combines the Lunar Month and the Solar Year.

A complete cycle takes 60 years (five cycles of 12 years each).

So that the Chinese New Year has, or will fall on the dates shown below:

Unlike the Western Horoscope, which is determined by the “month” of birth the Chinese method involves the year of birth.

The list here may vary from others due to regional variations.

In Hebrew, Rosh Hashanah means, literally, "head of the year" or "first of the year."

All holidays begin at sundown on the date before.

* In the leap year Adar I (30 days) is added between Shevat and Adar.

Adar then becomes Adar II.

As it is a lunar calendar with 12 lunar months in a year of about 354 days it is approximately 11 days shorter than the solar year.

The Hijri calendar is used to date events in many predominantly Muslim countries, and used by Muslims everywhere to determine the proper day on which to celebrate Islamic holy days.

Ramadan is the most venerated month and Muslims are supposed to abstain from eating, drinking, and sexual intercourse during the daylight.

Important dates in the Hijri) year are:

1 Muharram (Islamic New Year)
10 Muharram (Day of Ashurah)

12 Rabiul Awal (Milad un Nabi for Sunni Muslims)
17 Rabiul Awal (Milad un Nabi for Isna Ashari Shia Muslims Twelvers)

13 Rajab (Birthday of Imam Ali ibn Abi Talib.)
27 Rajab (Isra and Miraj)

1 Ramadan (first day of fasting)
19 Ramadan
21 Ramadan
27 Ramadan (Nuzul Al-Qur'an) (17 Ramadan in Malaysia)
Last third of Ramadan which includes Laylat al-Qadr

1 Shawwal (Eid ul-Fitr)

8-10 Dhu al-Hijjah (the Hajj to Mecca)
10 Dhu al-Hijjah (Eid ul-Adha)
18 Dhu al-Hijjah (Eide Ghadire Khum)

It is a 12-month, perennial calendar with equal quarters of 91 days, 13 weeks or 3 months.

Each quarter begins on Sunday and ends on Saturday and has three months of 31, 30, 30 days respectively.

To enable the World Calendar to correspond to the Gregorian calendar two additional days are added. One annually and one each leap year.

Worldsday: is added after 30 December and is a year-end world holiday.

Leapyear Day: is added after 30 June in the same way that 29 Feb is added now.

The off-calendar (intercalary) days are treated as holidays before resuming the calendar again and as such they are not assigned weekday designations.