sidereal

sidereal
Month Month (m[u^]nth), n. [OE. month, moneth, AS. m[=o]n[eth], m[=o]na[eth]; akin to m[=o]na moon, and to D. maand month, G. monat, OHG. m[=a]n[=o]d, Icel. m[=a]nu[eth]r, m[=a]na[eth]r, Goth. m[=e]n[=o][thorn]s. [root]272. See {Moon}.] One of the twelve portions into which the year is divided; the twelfth part of a year, corresponding nearly to the length of a synodic revolution of the moon, -- whence the name. In popular use, a period of four weeks is often called a month. [1913 Webster]

Note: In the common law, a month is a lunar month, or twenty-eight days, unless otherwise expressed. --Blackstone. In the United States the rule of the common law is generally changed, and a month is declared to mean a calendar month. --Cooley's Blackstone. [1913 Webster]

{A month mind}. (a) A strong or abnormal desire. [Obs.] --Shak. (b) A celebration made in remembrance of a deceased person a month after death. --Strype.

{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. 12 h. 44 m. 2.87 s.; the {nodical month}, or time of revolution from one node to the same again, in length 27 d. 5 h. 5 m. 36 s.; the {sidereal}, or time of revolution from a star to the same again, equal to 27 d. 7 h. 43 m. 11.5 s.; the {anomalistic}, or time of revolution from perigee to perigee again, in length 27 d. 13 h. 18 m. 37.4 s.; and the {tropical}, or time of passing from any point of the ecliptic to the same again, equal to 27 d. 7 h. 43 m. 4.7 s.

{Solar month}, the time in which the sun passes through one sign of the zodiac, in mean length 30 d. 10 h. 29 m. 4.1 s. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Sidereal — Si*de re*al, a. [L. sidereus, from sidus, sideris, a constellation, a star. Cf. {Sideral}, {Consider}, {Desire}.] 1. Relating to the stars; starry; astral; as, sidereal astronomy. [1913 Webster] 2. (Astron.) Measuring by the apparent motion of… …   The Collaborative International Dictionary of English

  • sidereal — 1630s, of or pertaining to the stars, earlier sideral (1590s), from Fr. sidereal (16c.), from L. sidereus starry, astral, from sidus (gen. sideris) star, constellation, probably from PIE root *sweid to shine (Cf. Lith. svidus shining, bright ) …   Etymology dictionary

  • sidereal — index stellar Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • sidereal — *starry, stellar, astral …   New Dictionary of Synonyms

  • sidereal — ► ADJECTIVE ▪ relating to the distant stars or their apparent positions in the sky. ORIGIN from Latin sidus star …   English terms dictionary

  • sidereal — [sī dir′ē əl] adj. [< L sidereus < sidus (gen. sideris), a star < IE base * sweid , to gleam > Lith svidù, to gleam] 1. of or pertaining to the stars 2. expressed in reference to the stars sidereally adv …   English World dictionary

  • Sidereal — The adjective sidereal can refer to various things, including:* Measurements of time: ** Sidereal time ** Sidereal day ** Sidereal month ** Sidereal year * Sidereal period of an object orbiting a star * Sidereal astrology * Sidereus Nuncius, or… …   Wikipedia

  • sidereal — adj. of or concerning the constellations or fixed stars. Phrases and idioms: sidereal clock a clock showing sidereal time. sidereal day the time between successive meridional transits of a star or esp. of the first point of Aries, about four… …   Useful english dictionary

  • sidereal — Of or pertaining to the stars. Although sidereal generally refers to the stars and tropical to the vernal equinox, sidereal time and the sidereal day are based upon the position of the vernal equinox relative to the meridian. The sidereal year is …   Aviation dictionary

  • sidereal — adjective /saɪˈdɪəriəl,saɪˈdɪriəl,səˈdɪriəl/ a) Of or relating to the stars. The field of sidereal astronomy, therefore, was virtually untrodden when, shortly after the beginning of his telescopic work, Herschel began his first review of the… …   Wiktionary

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