Calendar Background. The Chinese calendar's origins can be traced as far back as the 14th century BCE. The Shang oracle bones give evidence of a lunisolar calendar which has been much modified but persists to this day. It is believed that the Emperor Huangdi (Huang Ti or Huang Di) introduced the calendar between 3000 and 2600 BCE, or around ...

Jewish time reckoning is lunisolar, which means that the calendar keeps in sync with the natural cycles of both the Sun and the Moon. Featuring a body of complex regulations, exceptions, and mathematical rules, it is also designed to satisfy a number of requirements conveyed in the Jewish Holy Scripture.

The dates of many, but not all, Hindu holidays are determined according to the lunisolar calendar. In most cases, the festivals coincide with the Full Moon or the New Moon, or they are celebrated on the day after the Moon phase. Holidays based on the Hindu calendar include Maha Shivaratri, Holi, Guru Purnima, Ganesh Chaturthi, and Diwali.

Moon phases for 2025 or any year. New Moon and Full Moon calendar with precise times and simulation of the Moon phase today.

Lunisolar Calendar – Better Than Lunar, But No Solar. A lunisolar calendar is based on the movements of both the Moon (luni) and the Sun (solar). A year in the lunisolar calendar has twelve months, each either 29 or 30 days long, determined by the phases of the Moon. The length of the year is based on the Sun, similar to the solar calendar.

The Buddhist calendar employs a lunisolar system, meaning that it keeps track of the apparent movements of both the Moon and the Sun. It is derived from the lunisolar Hindu calendar . Developed in ancient Burma (present-day Myanmar ) and traditionally used in many regions of Southeast Asia, it no longer has the status of an official calendar in ...

The Modern-Day Calendar and Its Variants. The Gregorian calendar is the internationally used calendar system. It is derived from the Julian calendar developed in ancient Rome. The Julian Calendar. In the Julian calendar, a leap day is added every four years without exception, so an average Julian year is 365.25 days long.

The Persian Solar Hijri calendar starts its new year on the exact time and date of the March equinox, making it one of the most precise calendars in the world. The lunisolar calendar keeps track of the apparent movements of both the Moon and the Sun. The Chinese, Buddist, and Hindu calendars are lunisolar.

The Chinese calendar uses a solar term system that has 12 principal terms to indicate when the Sun's longitudes is a multiple of 30 degrees. Unlike all other months, the leap month does not contain a principal term ( Zhongqi ).

Like the Easter date based on the Gregorian calendar, Orthodox Easter falls on a Sunday between March 22 and April 25 in the Julian calendar (years 1753-2400). In the Gregorian calendar, this corresponds to April 3 to May 10. In some years, Orthodox Easter falls on the same day as western Easter.