Definition of Years. Meaning of Years. Synonyms of Years
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Definition of Years
year 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.
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.
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.
year Sothiac So"thi*ac, Sothic Soth"ic, a.
Of or pertaining to Sothis, the Egyptian name for the Dog
Star; taking its name from the Dog Star; canicular.
Sothiac, or Sothic, year (Chronol.), the Egyptian year
of 365 days and 6 hours, as distinguished from the
Egyptian vague year, which contained 365 days. The Sothic
period consists of 1,460 Sothic years, being equal to
1,461 vague years. One of these periods ended in July, a.
d. 139.
