The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.787 billion years to a single...

A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. A date is the designation...

Hijri calendar (Arabic: ٱلتَّقْوِيم ٱلْهِجْرِيّ, romanized: al-taqwīm al-hijrī), also known in English as the Islamic calendar, is a lunar calendar consisting...

as in James Harvey Robinson's 1921 book The Mind in the Making. Cosmic Calendar Calendar Kentucky Geological Survey (2011). "The Geological Time Scale v...

The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas...

A lunisolar calendar is a calendar in many cultures, that combines monthly lunar cycles with the solar year. As with all calendars which divide the year...

A lunar calendar is a calendar based on the monthly cycles of the Moon's phases (synodic months, lunations), in contrast to solar calendars, whose annual...

calendar Liturgical year Calendar of saints Advent calendar Wall calendar Geologic Calendar Cosmic Calendar Lunar calendar World calendar List of adoption dates...

calendar Basotho calendar Bengali calendar Berber calendar Bulgar calendar Byzantine calendar Caesar's Calendar Coptic calendar Discordian calendar EartHeaven...

before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in various...

the work and research of Carl Sagan and incorporates the use of the Cosmic Calendar, a concept developed by Sagan in his 1977 book The Dragons of Eden...

Cosmic time, or cosmological time, is the time coordinate used in the Big Bang models of physical cosmology.: 315  This concept of time avoids some issues...

Roman calendar was the calendar used by the Roman Kingdom and Roman Republic. Although the term is primarily used for Rome's pre-Julian calendars, it is...

The World Calendar is a proposed reform of the Gregorian calendar created by Elisabeth Achelis of Brooklyn, New York in 1930. The World Calendar is a 12-month...

History Big History Paleontology Time Periods Eras Epochs Calendars Astronomic time Cosmic Calendar Ephemeris Galactic year Metonic cycle Milankovitch cycles...

including elements such as the "Ship of the Imagination" and the "Cosmic Calendar", but features information updated since the 1980 series, along with...

Siderikian (~3,500 Ma to present). Geology portal Age of the Earth Cosmic calendar Deep time Evolutionary history of life Formation and evolution of the...

Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still...

year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most widely used calendar era. Common Era and Before the...

The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. In...

broad range of phenomena, including the abundance of light elements, the cosmic microwave background (CMB) radiation, and large-scale structure. The uniformity...

The adoption of the Gregorian Calendar has taken place in the history of most cultures and societies around the world, marking a change from one of various...

The Holocene calendar, also known as the Holocene Era or Human Era (HE), is a year numbering system that adds exactly 10,000 years to the currently dominant...

Counts: The Story of the Calendars. New York: Philosophical Library. Media related to Metonic cycle at Wikimedia Commons Eclipses, Cosmic Clockwork of the Ancients...

A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. For example, the current year is numbered...

History Big History Paleontology Time Periods Eras Epochs Calendars Astronomic time Cosmic Calendar Ephemeris Galactic year Metonic cycle Milankovitch cycles...

The Hebrew calendar (Hebrew: הַלּוּחַ הָעִבְרִי‎), also called the Jewish calendar, is a lunisolar calendar used today for Jewish religious observance...

world) is used in the Byzantine calendar (5509 BC). the Hebrew calendar (3761 BC). The Mesoamerican Long Count Calendar uses the creation of the fourth...

Timeline of women rabbis (1890s–present) Sikh gurus (1469–1666) The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its...

Christ (BC) are used when designating years in the Gregorian and Julian calendars. The term anno Domini is Medieval Latin and means "in the year of the...