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Topic: Sidereal month

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Sidereal day

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	The Moon - Zoom Astronomy
		The sidereal and synodic lunar months have different lengths.
		The sidereal month is the amount of time it takes the Moon to return to the same position in the sky with respect to the stars; the sidereal month is 27.321 days long.
		The synodic month is the time between similar lunar phases (e.g., between two full moons); the synodic month is 29.530 days long.
	www.enchantedlearning.com /subjects/astronomy/moon (1475 words)

	Month - LoveToKnow 1911
		At common law, "month" generally means a lunar month, although in mercantile matters it has been generally understood to mean a calendar month, but there is no general exception giving it that meaning in commercial documents.
		In the rules of the supreme court and in the county court rules month means a calendar month.
		In mercantile contracts in computing the period of a month the day from which the time is to begin to run is excluded, but in sentences of imprisonment the day on which the sentence begins is included, so that the numerically corresponding day in the month in which the sentence expires would be excluded.
	www.1911encyclopedia.org /Month (332 words)

	month - definition by dict.die.net
		Calendar months, the months as adjusted in the common or Gregorian calendar; April, June, September, and November, containing 30 days, and the rest 31, except February, which, in common years, has 28, and in leap years 29.
		Lunar month, the period of one revolution of the moon, particularly a synodical revolution; but several kinds are distinguished, as the synodical month, or period from one new moon to the next, in mean length 29 d.
		The commencement of a month was determined by the observation of the new moon.
	dict.die.net /month (613 words)

	Ast 110: Class 6
		This is the sidereal period of the Moon, a sidereal month.
		The reason this is different from the sidereal month is the same reason the solar day is different from the sidereal day, namely that the Earth is moving round the Sun all the time so the angle to the Sun is changing.
		The Solar Month (though the term Solar is not used; we talk of the Synodic Month) is longer than the sidereal month since it takes a bit longer for the Earth, Moon and Sun to be in a straight line again (for new moon, say).
	www.ifa.hawaii.edu /faculty/acowie/class99/class_6.html (862 words)

	month (Site not responding. Last check: )
		The synodic month is the length of the cycle of phases of the moon; for example, the interval between new moon and new moon.
		A tropical month is the average interval between instants when the line through the moon crosses the point on the ecliptic called the vernal equinox.
		The anomalistic month is the average interval between successive passages of the moon through its perigee.
	www.sizes.com /time/month.htm (359 words)

	Wikinfo \| Month
		The actual period of the Moon's orbit as measured in a fixed frame of reference is known as a sidereal month, because it is the time it takes the Moon to return to the same position on the celestial sphere among the fixed stars (Latin: sidus): about 27 1/3 days on average.
		223 synodic months is approximately equal to 239 anomalistic months and to 242 draconic months.
		One mnemonic for remembering the lengths of the months is to hold up your two fists with the index knuckle of your left hand against the index knuckle of your right hand.
	www.wikinfo.org /wiki.php?title=month (1361 words)

	Time
		Sidereal noon is the instant when the vernal equinox is on the celestial meridian.
		Sidereal days are divided into sidereal hours, minutes, and seconds like solar days, but the length of a sidereal hour is slightly shorter than a solar hour.
		The moon’s sidereal period is the sidereal month.
	library.thinkquest.org /29033/begin/time.htm (1915 words)

	Months, Seasons and Years
		The different amount of time required by the sidereal year results from the Earth's wobbling like a top as it spins on its axis while orbiting the sun.
		Month lengths formerly followed motions of the moon.
		But our Gregorian Calendar's irregular distribution of days in the various months no longer corresponds to either the lunar cycle or to that of any other object in the heavens.
	www.12x30.net /months.html (896 words)

	Month - Wikipedia, the free encyclopedia
		In Egyptian mythology, Month is an alternate spelling for Menthu.
		The "draconic/draconitic" month refers to the mythological dragon that lives in the nodes and regularly eats the Sun or Moon during an eclipse.
		The calendar is peculiar in that the months always start on the same weekday rather than on the same date.
	en.wikipedia.org /wiki/Month (1807 words)

	month - HighBeam Encyclopedia
		month in chronology, the conventional period of a lunation, i.e., passage of the moon through all its phases.
		For the computation of the month and its harmony with the solar calendar and for the months in others than the Gregorian calendar, see calendar.
		For the difference between the sidereal month and the synodic month, see moon.
	www.encyclopedia.com /doc/1E1-month.html (314 words)

	synodic period - HighBeam Encyclopedia (Site not responding. Last check: )
		The synodic period of the moon, which is called the lunar month, or lunation, is 29 1/2 days long; it is longer than the sidereal month.
		One sidereal month later it will not yet be full, since it must travel further in its orbit around the earth to reach the point of opposition, which has moved relative to the stars because of the earth's motion.
		For the inferior planets the synodic period is longer than the sidereal period, but for the superior planets it is shorter.
	www.encyclopedia.com /doc/1E1-synodicp.html (405 words)

	Trivishtapam - Calendar - Astronomical - Lunar Month
		The mean length of a lunar sidereal month is 27.32166 civil solar days and divided by 27 this gives the lunar sidereal day a mean length of 1.011913 civil solar days.
		I note that the choice of 30 synodic days and 27 sidereal days (and before that, of 27 asterism segments) in the respective months was made so that the length of each day would be closest to the length of the solar day.
		However, since the length of the synodic and sidereal days has been calculated using the mean length of the synodic and sidereal months, the actual length of a synodic or sidereal day can be more or less than that of a solar day (respectively).
	samvit.org /calendar/astro/lunmon.html (858 words)

	Formulas - Sidereal Time (Site not responding. Last check: )
		A sidereal day is two successive upper meridian crossings by the Sun of the Vernal Equinox - of course and easier way to remember this is that a sidereal day is measured by a complete Earth rotation with respect to the stars (not the Sun which would be a standard Solar day).
		A Sidereal Month is also used, and is the orbit of the Moon with respect to the stars which is 27.3 days.
		A Synodic Month is the "standard" Moon orbit about the Earth - from full moon to full moon - which is 29.5 days.
	astronomyonline.org /Science/SiderealTime.asp (336 words)

	Month (Site not responding. Last check: )
		:''In Egyptian mythology, Month is an alternate spelling for Menthu.'' The month is a unit of time, used with calendars, which is approximately as long as some natural period related to the motion of the Moon (i.e.
		The actual period of the Moon's orbit as measured in a fixed frame of reference is known as a sidereal month (\\sī-dir'-ē-ǝl, sǝ- \\), because it is the time it takes the Moon to return to the same position on the celestial sphere among the fixed stars (Latin: sidus): 27.
		Hence the time it takes the Moon to return to the same node is again shorter than a sidereal month: this is called the draconic (\\drā-cŏn'-ĭk\\) month, which has an average length of about 27 1/5 days.
	month.kiwiki.homeip.net (1493 words)

	Sidereal Time (Site not responding. Last check: )
		Sidereal time is time kept with respect to the distant stars.
		A sidereal day lasts from when a distant star is on the meridian at a point on Earth until it is next on the meridian.
		A sidereal day lasts 23 hours and 56 minutes (of solar time), about 4 minutes less than a solar day.
	astrosun2.astro.cornell.edu /academics/courses/astro201/sidereal.htm (276 words)

	Aryabhatt : Vedic Astrology lessons (Site not responding. Last check: )
		The synodic month is larger than a sidereal month because it indicates the relation of the moon with the sun.
		An anomalistic lunar month is the lunar equivalent to the solar anomalistic year which indicates the passage of the sun around the earth from perigee to perigee.
		An intercalary month occurs in 32 solar months and 16 days.This means that an intercalary month occurs in every three years and this year has thirteen lunar months.
	www.aryabhatt.com /vediclessons/vediclesson6.htm (1251 words)

	Some Notes About the Solar System at MROB
		Enceladus sidereal month to Dione sidereal month: 1:2.
		The sidereal period of a planet is the amount of time it takes for the planet to complete one orbit, when viewed in relation to the stars.
		The sidereal periods of each planet vary from one orbit to the next, due to the gravitational influence of the other planets.
	home.earthlink.net /~mrob/pub/planets.html (1706 words)

	Notable Properties of Specific Numbers at MROB
		The tropical month is the amount of time for the Moon to complete one orbit around the Earth in relation to the equinox and solstice points (which shift relative to the stars because of precession).
		The sidereal month is the amount of time for the Moon to complete one orbit around the Earth in relation to the stars (and thus, Zodiac signs).
		30 is the closest integer to the length of the synodic month.
	home.earthlink.net /~mrob/pub/math/numbers-5.html (2875 words)

	Month (Site not responding. Last check: )
		Hence the time it takes the Moon to return to the same node is again shorter than a sidereal month: this is called the nodical, draconitic or draconic (\\dr&257;-c&335;n'-&301;k\\) month.
		The "draconitic/draconic" Month refers to the mythological dragon that lives in the nodes and regularly eats the Sun or Moon during an eclipse.
		The months in the lunar calendar are: Chaitra Vaishaakha Jyaishtha Aashaadha Shraavana Bhaadrapada Aashvayuja Kaartika Maargashiirsha Pausha Maagha Phaalguna These are also the names used in the Indian National Calendar for the newly redefined months.
	month.iqnaut.net (1501 words)

	Eclipses
		Sidereal period: The period of revolution of the moon around the earth.
		The Anomalistic month is longer than the sidereal month: Since the line of apsides makes one complete revolution in a period of 8.85 years, the perigee and apogee positions are continuously changing their direction in the sky.
		Therefore, each successive perigee or apogee position is slightly ahead of its last location, and the moon must complete one full revolution (sidereal period) around the earth plus travel the additional distance that the apsis has moved during the sidereal period.
	www.astronomy.org /astronomy-survival/eclipse.html (1238 words)

	The Lunar Planner: Sidereal Astrology
		Learn about Earth's Precession; the relationship between the tropical and sidereal zodiacs; the astrological ages, the intercession of the Holy Cross; measurement of the precessional rate, and introducing the Galactic Ayanamsa: Reckoning of the sidereal zodiak to the galactic axis of the Holy Cross.
		This is a wonderful tool for the novice or seasoned sidereal astrologer, for the astronomer, for the casual sky watcher, or simply for those wishing to know more of the Greater Heavens under which we live.
		Month by month, lunar chapter by lunar chapter, we come to see our experiences in a new light and clarity, as part of the unfoldment of a grand divine symphony.
	www.lunarplanner.com /index.html (3552 words)

	The Earth and Moon: Sidereal and Synodic Time
		The siderial month is the time it takes for the Moon to complete one full orbit of the Earth, measured with respect to the distant stars.
		The major assumption in determing a sidereal month is that the distant stars are fixed relative to Earth, and for the most part they are stationary.
		The sidereal month is the Moon's true orbital period and is equal to 27.3 days.
	inkido.indiana.edu /a100/earthmoon4.html (224 words)

	Earth- The Moon Page 2
		The moon's revolution around earth is measured in synodic months and sidereal months.
		A synodic month is about 29 1/2 days long, and is the period from one new moon to the next new moon.
		A sidereal month is about 27 1/3 days, and is the amount of time it takes for the moon to travel around the earth in relation to stars.
	library.thinkquest.org /C002416/earth/moon2.htm (777 words)

	Sidereal Astrology
		The sidereal zodiak is a set of signs, much like the tropical signs, except they do not move in the ecliptic.
		The RELATIONSHIP of the moving tropical zodiak with respect to the fixed sidereal zodiak reveals the nature of the relationship of lost incarnate personality consciousness with respect to the true soul level awareness--that is, where we are in the evolutionary unfoldment of human consciousness.
		I prefer to reckon the sidereal zodiak to the galactic axis of the Holy Cross.
	www.lunarplanner.com /siderealastrology.html (3265 words)

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