one month (of moon) is one time unit and a part of a yearly.

Depending upon definition is one month of different duration:

  • Generally use the span of 4 weeks.
  • Calendars use month for the timing. Arrange in additionit one time interval of a calendar month a name of the month too.
    In our calendar one month takes 28, 29, 30 or 31 days.
  • One month is in the astronomical sense as the time interval of a complete circulation of a natural satellite (satellite). In the closer„Month “only the moon refers senses: The moon month takes 29 ½ days depending upon definition 27 ⅓ and.
An overview of many uses gives the category: Month

the term „month “becomes both the designation of time intervals and of times inCalendar system uses:

It was more schwanger in the sixth month (time stretched) and bore the child in the month October (time point).

Table of contents

the month

time measure: In the measurement the day formulaful described as

a unit of the time
the unit symbol: m
symbol for physical dimension time is: t.

The monthno SI is - unit.

calendar month

time interval: A fundamental value of the calendar calculation.

Calendar month
our calendar is the Gregorian calendar: It has 7 months to 31 days, 4 months to 30 days and one - February- with 28 days, in one leap year with 29 days ( the 24. February is the intercalary day).
12 months result in one year. The monthly days are sequentially nummeriert. A calendar month falls in 5 weeks, very rarely only in 4.
The average duration amounts to: 30,437 days

bases of the calendar calculation

Lunationen - and/or. their average value, the Synodi month - on the basis more directly ground mondphasen formed the basic modules of the first calendars, which lunar or moon calendar was, and laterpartly to Lunisolarkalendern were developed further. Such calendars are also today still in far parts of the world common, and for example the Jewish calendar, the Islamic calendar and the traditional Chinese calendar call further a phase run of the moon month.

Meanwhilea unganzzahlige quantity of moon months lies in the time of a sun yearly, so that one had to adapt the length of the months accordingly during introduction of a solar or a sun calendar. Such a connection of the year length to the duration of an earth revolution around the sunand the associated separation of the months from the moon run first 238 v. took place in old Egypt in the year. Chr. and became of Julius Cäsar in the year 46 v.Chr. also for the Roman republic taken over (with which these years actually meaningful epochs for the time calculation of the juliano Gregorian calendar would be).

Beside this Julian calendar and it replacing and today Gregorian calendar everyday for most humans are also still some other sun calendars used, with those (calendar) a month than a certain partthe sun yearly with a fixed number of days are defined, for example the Greek-orthodox calendars, the koptische calendar, the zoroastrische calendar, the Iranian calendar, the Malayalam calendar as well as different southasiatic calendars.

names of the month

time: OneSize of the time calculation.

At present is May (the 05. Month of the yearly came

there) the Julian-Gregorian calendar of the Romans on us, is also the today generally common names of the month of latin of origin, and most of it leave themselves openthe old-Roman calendar, which forerunners of the Julian calendar lead back. Also with that most other peoples, those the Julian-Gregorian calendar probably use are derived the generally used month names from latin. Meanwhile existed in some languages also beside ownMonthly designations (the newer forms of the Germans are down indicated) or were occasionally inserted, as for example in the French revolution calendar.

Today the term designates „month “in the Gregorian calendar only fixed yearly sections, their length of the one moon cycle more or lessstrongly deviates.

Etymologie of the names of the month

the 12 months are (the old German names in parentheses):

January (Austrian also Jänner)
(hardening, ice moon)
after Janus, the Beschützer of the city gates, God of the out and entrance, in the transferred sensethe beginning and the end, doppelköpfig represented, looks after two sides, i.e. forward and backwards.Latin ianua „threshold “(to the new year).
February (Austrian also Feber)
(Hornung, fusion moon, rope moon, fool moon, Rebmond, Hintester)
of the cleaning and/or. Sühnemonat, because at year end thatFebrua for the cleaning of the living persons and the Sühnung of the deceased were made firmly (Februaries „to clean “).
(Lenzing, spring moon)
designated after Mars (mythology), the God of the war and the vegetation. In the old-Roman calendar the year began with March,from it the shift of the numeric months results Septembers until Decembers and February as year end. Since 153 v. Chr. for one year the selected consuls stepped their office in each case at the 1 into Rome. January on, that itself soon asBeginning of the year in-patriated.
(Launing, Ostermond)
derived from lat. aperire „open “, the month of the opening and/or. blossoming.
Maia, a Bergnymphe, daughter of the Atlas and the Pleione gave this month the names. On the arkadischen mountainKyllene ground itself Zeus, the God father, with it. Hermes, the God messenger is their son. Maia was responsible for growth and Vermehrung.
(would break, breaking moon)
designated after Juno, a altitalischen divinity, that most characteristics of the Greek God queenHera were transferred.
(, hay moon hires)
originally Quintilis, „the fifth month “. Birth month Cäsars (Gaius Julius Cäsar). After it this month became since 44 v. Chr. Julius mentioned.
(Ernting, harvest moon, until moon)
this was originally the sixth month, corresponding Sextiliscalled, the old Roman calendar. It became honours of the first Roman emperor Augustus in the year 8 v. Chr. in Augustus renamed. This was connected with an extension of the monthly around one day, which was taken to February, after whichthe month of the Augustus was just as long as the Caesars. 22 years later, 14 n.Chr., August the month of death of its name patron became. (The sequence of the events seems strange, but at least the last year may be considered as safe.)
(Scheiding, autumn moon)
The sieved month (Latin septem „sieve “) in the Roman calendar. By this and the following names of the month one can recognize that one originally began with the counting in the month March. It should be designated after the emperor Tiberius.
(Gilbhart, Gilbhard, wine moon)
The respected month (octem „eight “) after the Roman calendar. Also more hierier the designation Domitianus could not become generally accepted voucher? .
(fogging, wind moon, winter moon)
month nine (novem „nine “).
(July moon, welfare moon, Christian moon, dark moon)
of the 10. Month (decem „ten “) in the Julian calendar.

See also: Calendar (Roman realm), from which our names of the month originate.

astronomical definitions

month as a period of the moon on its circulation around the earth.

the time interval of a Neumondto the next Neumond. The Lunation is the actual cause for the monthly term.
It varies by the complicated moon movement between 29 D 6 ½ h and 29d 20h.

The following astromomischen months describe middle ones of values, therefore on one standard epoch (at present usually J2000.0) are referred:

Synodi month
the time for the rereaching of same Elongation of the moon to the sun, the average value of the Lunationen.
Duration 2000.0: 29,53 days = 29d 12h 44m
Sideri month
the time for a circulation of the moon around thoseEarth regarding a firm direction in the area, that is thus a complete circling relative to a fixed star.
Duration 2000.0: 27,32 days = 27d 7h 43m
tropical month
the time for a circulation related to the Frühlingspunkt.Thus it refers also to the equator and is the cycle of the declination of the moon.
Duration: By the precession drift of the Frühlingspunktes it is about 5 s more briefly than the Sideri month.
Drakoniti month
the period of two passages by the same moon knot. It stands in connection with the cycle of the suns - and lunar eclipses (Sarosperiode).
Duration 2000.0: 27,21 days = 27d 5h 6m
Anomalisti month
the time between two sequential Perigäumsdurchgängen of the moon, thus ofa nearest-to-Earth point to the next. The anomaly tables month describes the actual course period the moon.
Duration 2000.0: 27,555 days = 27d 13h 19m

in the astronomy the time interval between two repetitions of an event, that becomes general with the orbit of any Moon around its planet , each complete circulation is thus connected, when month designates. Insoferne is the expression “month” thus the course period synonymous.

In the solar system these time intervals last depending upon moon from only few hours to several ground connection years.


see also

Wiktionary: Month - word origin, synonyms and translations

Article for the chronology of mankind:
linear units of the time calculation cyclic unitsthe time calculation
millenium century decade year (calendar) month week day (calendar)
starting from 10. Millenium v. Chr. starting from 40. Century v. Chr. starting from 390er v. Chr. starting from 400 v. Chr. 1. January to 31. December
further articlesabout time:
An overview of entire geologic history offers the geological time scale.
From the Big Bang to the emergence of the earth see early history of the universe.
For the units of time measurement see: Second, minute, hour.


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