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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
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2. (Astron.) Measuring by the apparent motion of the stars;
designated, marked out, or accompanied, by a return to the
same position in respect to the stars; as, the sidereal
revolution of a planet; a sidereal day.
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{Sidereal clock}, {day}, {month}, {year}. See under {Clock},
{Day}, etc.

{Sideral time}, time as reckoned by sideral days, or, taking
the sidereal day as the unit, the time elapsed since a
transit of the vernal equinox, reckoned in parts of a
sidereal day. This is, strictly, apparent sidereal time,
mean sidereal time being reckoned from the transit, not of
the true, but of the mean, equinoctial point.
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Year \Year\, n. [OE. yer, yeer, [yogh]er, AS. ge['a]r; akin to
OFries. i?r, g?r, D. jaar, OHG. j[=a]r, G. jahr, Icel. [=a]r,
Dan. aar, Sw. [*a]r, Goth. j?r, Gr. ? a season of the year,
springtime, a part of the day, an hour, ? a year, Zend
y[=a]re year. [root]4, 279. Cf. {Hour}, {Yore}.]
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1. The time of the apparent revolution of the sun trough the
ecliptic; the period occupied by the earth in making its
revolution around the sun, called the astronomical year;
also, a period more or less nearly agreeing with this,
adopted by various nations as a measure of time, and
called the civil year; as, the common lunar year of 354
days, still in use among the Mohammedans; the year of 360
days, etc. In common usage, the year consists of 365 days,
and every fourth year (called bissextile, or leap year) of
366 days, a day being added to February on that year, on
account of the excess above 365 days (see {Bissextile}).
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Of twenty year of age he was, I guess. --Chaucer.
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Note: The civil, or legal, year, in England, formerly
commenced on the 25th of March. This practice continued
throughout the British dominions till the year 1752.
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2. The time in which any planet completes a revolution about
the sun; as, the year of Jupiter or of Saturn.
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3. pl. Age, or old age; as, a man in years. --Shak.
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{Anomalistic year}, the time of the earth's revolution from
perihelion to perihelion again, which is 365 days, 6
hours, 13 minutes, and 48 seconds.

{A year's mind} (Eccl.), a commemoration of a deceased
person, as by a Mass, a year after his death. Cf. {A
month's mind}, under {Month}.

{Bissextile year}. See {Bissextile}.

{Canicular year}. See under {Canicular}.

{Civil year}, the year adopted by any nation for the
computation of time.

{Common lunar year}, the period of 12 lunar months, or 354
days.

{Common year}, each year of 365 days, as distinguished from
leap year.

{Embolismic year}, or {Intercalary lunar year}, the period of
13 lunar months, or 384 days.

{Fiscal year} (Com.), the year by which accounts are
reckoned, or the year between one annual time of
settlement, or balancing of accounts, and another.

{Great year}. See {Platonic year}, under {Platonic}.

{Gregorian year}, {Julian year}. See under {Gregorian}, and
{Julian}.

{Leap year}. See {Leap year}, in the Vocabulary.

{Lunar astronomical year}, the period of 12 lunar synodical
months, or 354 days, 8 hours, 48 minutes, 36 seconds.

{Lunisolar year}. See under {Lunisolar}.

{Periodical year}. See {Anomalistic year}, above.

{Platonic year}, {Sabbatical year}. See under {Platonic}, and
{Sabbatical}.

{Sidereal year}, the time in which the sun, departing from
any fixed star, returns to the same. This is 365 days, 6
hours, 9 minutes, and 9.3 seconds.

{Tropical year}. See under {Tropical}.

{Year and a day} (O. Eng. Law), a time to be allowed for an
act or an event, in order that an entire year might be
secured beyond all question. --Abbott.

{Year of grace}, any year of the Christian era; Anno Domini;
A. D. or a. d.
[1913 Webster] year 2000 bug