Introductory material
Reading edition
Astronomical motions on which our time is founded. — Reasons for selecting the sidereal day as a basis for our 24-hour day. — Year of the seasons shorter than the zodiacal year. — Precession of the equinoxes. — Earth's rotation most uniform motion known to us. — Time stars and transits. — Local time. — The date line. — Standard time. — Beginning and ending of a day. — Proposed universal time. — Clock dial for universal time and its application to business. — Next great improvement in clocks and watches indicated. — Automatic recording of the earth's rotation. — Year of the seasons as a unit for astronomers. — General conclusions Page 53