Whois & Analysis for sierrafamily.org

A calendar is a system of organizing days for social, religious, commercial or administrative purposes.

This is done by giving names to periods of time, typically days, weeks, months, and years.

A date is the designation of a single, specific day within such a system.

A calendar is also a physical record (often paper) of such a system.

A calendar can also mean a list of planned events, such as a court calendar or a partly or fully chronological list of documents, such as a calendar of wills.

The Portable Document Format (commonly referred to as PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems.

Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it.

Printing is a process for reproducing text and images using a master form or template.

The earliest examples include Cylinder seals and other objects such as the Cyrus Cylinder and the Cylinders of Nabonidus.

The earliest known form of woodblock printing came from China dating to before 220 A.D.

Later developments in printing include the movable type, first developed by Bi Sheng in China around 1040 AD.

Johannes Gutenberg introduced mechanical movable type printing to Europe in the 15th century.

His printing press played a key role in the development of the Renaissance, Reformation, the Age of Enlightenment, and the scientific revolution and laid the material basis for the modern knowledge-based economy and the spread of learning to the masses.

A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates.

The traditional concept arose with the cycle of moon phases; such months (lunations) are synodic months and last approximately 29.53 days.

From excavated tally sticks, researchers have deduced that people counted days in relation to the Moon's phases as early as the Paleolithic age.

Synodic months, based on the Moon's orbital period with respect to the Earth-Sun line, are still the basis of many calendars today, and are used to divide the year.

A week is a time unit equal to seven days.

It is the standard time period used for cycles of rest days in most parts of the world, mostly alongside—although not strictly part of—the Gregorian calendar.