siderotechny (siderotekni)

[ +-ex.] Atribe The conjunction of the planets Jupiter and Saturn is one of the rarest of sidereal events. Harper's Mag ., LXXVI. 169. Sidereal clock or chronometer, a clock or chronometer that keeps sidereal time. - Sidereal day, hour, month. See the nouns. - Sidereal magnetism, according to the believers in animal magnetism, the influence of the stars upon patients. Imp. Dict. - Sidereal system, the system of stars. The solar system is considered a member of the sidereal system, in the same sense as the earth with its moon, and Saturn with its satellites, are considered members of the solar system. - Sidereal time, time as measured by the apparent diurnal motion of the stars. The sidereal day, the fundamental period of sidereal is taken to begin and end with the pa age over the merid. ian of the vernal equinox, the first point of Aries, or the origin of right ascension (three names for the same thing). There is just one more sidereal than mean solar day sidereal year. The sidereal day is 3m. 55.91s. shorter than ean solar day. The sidereal time of mean noon is 0 a mean hours on March 22d (21st, leap-years), 6 hours on June 21st, 12 hours on September 20th (21st, years preceding leap Years), and 18 hours on December 21st (20th, leap-years), Green wich it is 0 hours on March 22d in all years, and These dates are the meridian of Washington. For 6 hours on June 22d in years preceding leap-years. Sidereal time is the only uniform standard of time-measurement; and this cannot be absolutely uniform, since the friction of the tides must tend to retard the motion of the earth.-Sidereal year, the time in which the earth makes one complete revolution round the sun. The ratio of the sidereal year to the tropical year is that of unity side-rod (sīd'rod), n. siderograph siderographic + -al. ] Same as siderographic. siderographist (sid-e-rog'ra-fist), n. [ rograph-y + -ist.] One who engraves steel rograph-y + plates, or performs work by means of such plates.