month


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month,

in chronology, the conventional period of a lunation, i.e., passage of the moon through all its phases. It is usually computed at approximately 29 or 30 days. For the computation of the month and its harmony with the solar calendar and for the months in others than the Gregorian calendar, see calendarcalendar
[Lat., from Kalends], system of reckoning time for the practical purpose of recording past events and calculating dates for future plans. The calendar is based on noting ordinary and easily observable natural events, the cycle of the sun through the seasons with equinox
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. For the difference between the sidereal month and the synodic month, see moonmoon,
natural satellite of a planet (see satellite, natural) or dwarf planet, in particular, the single natural satellite of the earth. The Earth-Moon System

The moon is the earth's nearest neighbor in space.
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. Certain stones have in ancient and modern times been connected with the months; these lucky stones, or birthstones, are often given as follows: January [from the god JanusJanus
, in Roman religion, god of beginnings. He was one of the principal Roman gods, the custodian of the universe. The first hour of the day, the first day of the month, the first month of the year (which bears his name) were sacred to him.
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]: garnet; February [Lat.,=expiatory, because of ancient rites]: amethyst; March [from the god MarsMars,
in Roman religion and mythology, god of war. In early Roman times he was a god of agriculture, but in later religion (when he was identified with the Greek Ares) he was primarily associated with war.
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]: bloodstone or aquamarine; April: diamond; May: agate or emerald; June [from the gens Junius]: pearl or moonstone; July [from Julius CaesarCaesar, Julius
(Caius Julius Caesar), 100? B.C.–44 B.C., Roman statesman and general. Rise to Power

Although he was born into the Julian gens, one of the oldest patrician families in Rome, Caesar was always a member of the democratic or popular party.
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]: ruby or onyx; August [from AugustusAugustus
, 63 B.C.–A.D. 14, first Roman emperor, a grandson of the sister of Julius Caesar. Named at first Caius Octavius, he became on adoption by the Julian gens (44 B.C.) Caius Julius Caesar Octavianus (Octavian); Augustus was a title of honor granted (27 B.C.
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]: carnelian or peridot; September [Lat.,= seven; formerly the 7th month]: chrysolite or sapphire; October [eight]: beryl, tourmaline or opal; November [nine]: topaz; December [ten]: turquoise or zircon.
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Month

month

The period of the Moon's revolution around the Earth with reference to some specified point in the sky (see table). The differences in the monthly periods result from the complicated motion of the moon.

Month

 

an interval of time nearly equal to the period of revolution of the moon about the earth. Different types of months are distinguished (see Table 1 and Figure 1). These include (1) the synodic month, which is the period of the sequence of the lunar phases (it serves as the basis for lunar calendars);

Table 1. Length of various types of months
Type of monthMean solar daysMean solar time
Synodic .....29.53058829 days12 hr44 min3 sec
Sidereal .....27.32166127 days7 hr43 min12 sec
Tropical .....27.32158227 days7 hr43 min4 sec
Anomalistic .....27.55455027 days13 hr18 min33 sec
Nodical .....27.21222027 days5 hr5 min36 sec

(2) the sidereal month, during which the moon performs a complete revolution about the earth and returns to its original position relative to the stars; (3) the tropical month, which is the period during which the moon returns to a given longitude; (4) the anomalistic month, which is the interval of time between successive passages of the moon through the perigee; and (5) the nodical month, which is the period of time between successive passages of the moon through the same node of its orbit (this concept is important for the theory of eclipses). In the Gregorian calendar, the year is divided into 12 months, each month containing from 28 to 31 days; this calendar does not agree with the lunar phases.

Figure 1. Difference between synodic and sidereal months. (1) and (3) are the relative posiositions of the sun, earth, and moon at which a full moonon occurs (a time interval of oneone synodic month); (2) is the position of the moon after a complete revolution about the earth (a time interval of one siderealreal month).

month

[mənth]
(astronomy)
The period of the revolution of the moon around the earth (sidereal month).
The period of the phases of the moon (synodic month).
The month of the calendar (calendar month).

month

1. one of the twelve divisions (calendar months) of the calendar year
2. the period of time (tropical month) taken by the moon to return to the same longitude after one complete revolution around the earth; 27.321 58 days (approximately 27 days, 7 hours, 43 minutes, 4.5 seconds)
3. the period of time (sidereal month) taken by the moon to make one complete revolution around the earth, measured between two successive conjunctions with a distant star; 27.321 66 days (approximately 27 days, 7 hours, 43 minutes, 11 seconds)
4. the period of time (lunar or synodic month) taken by the moon to make one complete revolution around the earth, measured between two successive new moons; 29.530 59 days (approximately 29 days, 12 hours, 44 minutes, 3 seconds)
References in classic literature ?
There Burton, who was completely worn out, lay ill for several months, during which time Speke made a push to the northward of more than three hundred miles, going as far as Lake Okeracua, which he came in sight of on the 3d of August; but he could descry only the opening of it at latitude two degrees thirty minutes.
814-818) Again, few know that the twenty-seventh of the month is best for opening a wine-jar, and putting yokes on the necks of oxen and mules and swift-footed horses, and for hauling a swift ship of many thwarts down to the sparkling sea; few call it by its right name.
DBK (41) The month is divided into three periods, the waxing, the mid-month, and the waning, which answer to the phases of the moon.
750-759) Do not let a boy of twelve years sit on things which may not be moved (39), for that is bad, and makes a man unmanly; nor yet a child of twelve months, for that has the same effect.
What can I recall of her during the past six months, before I close my journal for the night?
In other words, it is always Laura Fairlie who has been writing to me for the last six months, and never Lady Glyde.
Between the ages of seven months and eight months those children were changed in the cradle"--he made one of this effect- collecting pauses, and added--"and the person who did it is in this house
From seven months onward until now, A has still been a usurper, and in my finger record he bears B's name.
For three months I kept this pace, only breaking it on several occasions.
And while I forgot that I had plunged into the books nineteen hours a day for three solid months, Charley Le Grant shifted my outfit into a big Columbia River salmon boat.
The first month, members receive a cookbook and a basket filled with ingredients for a complete Italian meal.
Net loss for the three months ended September 30, 2006, including both continuing and discontinued operations, was $190,000 compared to net income of $240,000 for the three months ended September 30, 2005.