Month

One month ( masculine, of the moon) is a unit of time and part of a year.

Generally

Depending on the definition is a month of varying duration:

• The period of 28, 29, 30 or 31 consecutive days. Calendar months to use time division. To this end, they organize a period of one calendar month to a month name.
• A month is defined in the astronomical sense, as the period of a complete revolution of a natural satellite ( satellite ). In a narrower sense, " month " refers only to the Earth's moon: The lunar month lasts depending on the definition between 27 ⅓ and 29 ½ days.

• In private law in Germany one months x is considered to be the period from day to day x of the following month. If this x has no day, the period ends on the last day of the following month ( § 188 para 2 and 3 BGB).
• In rare cases, the span of 4 weeks.
• In banking, one months lasts always 30 days a year for banks takes therefore only 360 days.
• The symbol is M

The term " month " is used to refer to periods of time in the calendar system:

Basics of calendar calculations

Lunations - or their mean value, the Synodic month - on the basis of equal Erdmondphasen formed the basic building blocks of the first calendar, which was lunar or lunar calendar, and were later partially developed into lunisolar calendars. Such calendars are still in many parts of the world use, and for example the Jewish calendar, the Islamic calendar and the traditional Chinese calendar continues to denote a phase cycle of the moon for the month.

Indes is the time of a solar year a non-integral amount of lunar months, so you had to adjust the length of the months corresponding with the introduction of a solar or solar calendar. Such a bond length of the year to the duration of a Erdumlaufs around the sun and the separation of months associated the moon race took place first in ancient Egypt in 238 BC and was founded by Julius Caesar in 46 BC for the Roman assumed Republic ( which this year actually meaningful epochs for the era of juliano - gregorian calendar would be ).

In addition to this the Julian calendar and it detaching and now everyday for most people Gregorian calendar are also some other solar calendar in use in which a (calendar) month is defined as a certain part of the solar year with a specified number of days, for example, the Greek Orthodox calendar, the Coptic calendar, the Zoroastrian calendar, the Iranian calendar, the Malayalam calendar and various South Asian calendars.

Month names

Time: One size the era.

Since the Julian - Gregorian calendar was adopted by the Romans in the German-speaking area, are also now commonly in use month names of Latin origin, and most of them can be attributed to the ancient Roman calendar, return the progenitor of the Julian calendar. Even with the probably most other people who use the Julian - Gregorian calendar, the month generally related names are derived from the Latin. Meanwhile existed in several languages, alongside own month names ( the newer forms of German are given below ) or were sometimes introduced, such as in the French Revolutionary calendar.

Today, the term " month " means only fixed in the Gregorian calendar year periods, the length of which differs more or less from that of a lunar cycle.

Etymology of the name of the month: The 12 months ( the old German names in parentheses):

See also: Calendar ( Roman Empire ), from which comes our month names.

Astronomical definitions

The month as a period of the Moon in its orbit around the Earth.

The following describe astronomical months Mean values ​​based on a standard epoch (currently usually J2000.0 ) are thus related:

In astronomy, it is generally the time between two repetitions of an event related to the orbit of any moon around its planet, so every full circulation, called the month. In this respect, the term " month " is thus the orbital period interchangeably.

Short forms

With frequent use, the month names are abbreviated as follows: Jan, Feb, Mar, Apr, May Jun, Jul, Aug, Sep, Okt, Nov, December

Of February, in the case that it has (generally every 4 years) referred to as " leap month " 29 days.