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horology

(Encyclopedia) horologyhorologyhōrŏlˈəjē [key], science of measuring time and technology of constructing instruments for its measurement or recording. Early measurements of the passage of time were…

sidereal year

(Encyclopedia) sidereal year, time required for the earth to complete an orbit of the sun relative to the stars. The sidereal year is 365 days, 6 hr, 9 min, 9.5 sec of mean solar time (see solar time…

day

(Encyclopedia) day, period of time for the earth to rotate once on its axis. The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun…

geologic timescale

(Encyclopedia) CE5 geologic timescale, a chronological scale of earth's history used to measure the relative or absolute age of any part of geologic time. Of the numerous timescales, the most…

second

(Encyclopedia) second, abbr. sec or s, fundamental unit of time in all systems of measurement. In practical terms, the second is 1/60 of a minute, 1/3,600 of an hour, or 1/86,400 of a day. Since the…

Janus, in Roman religion

(Encyclopedia) JanusJanusjāˈnəs [key], in Roman religion, god of beginnings. He was one of the principal Roman gods, the custodian of the universe. The first hour of the day, the first day of the…

occultation

(Encyclopedia) occultationoccultationŏkˌəltāˈshən [key], in astronomy, eclipse of one celestial body by another, e.g., when the moon lies between a star and the earth. Occultations of stars by the…

sundial

(Encyclopedia) sundial, instrument that indicates the time of day by the shadow, cast on a surface marked to show hours or fractions of hours, of an object on which the sun's rays fall. Although any…

Hodgson, Ralph

(Encyclopedia) Hodgson, Ralph, 1871–1962, English poet. He wrote five volumes of poetry before his collected poems appeared in 1917. After a silence of nearly 40 years—during which time he taught in…