On Time Errata



p. 18, fig, 1.1: The caption should read:

The Ptolemaic model of the universe, adapted from an image in Camillo Agrippa's Treatise on the Science of Arms. Note that south is at the top, which was not uncommon in Renaissance astronomical diagrams. The fixed stars seem to rotate around the earth's axis once per sidereal day along paths parallel to the celestial equator. The zodiac signs are located on the ecliptic, the path of the sun's apparent motion against the backdrop of stars. Either the ecliptic or the celestial equator can be used as the basis for a coordinate system to locate astronomical objects.

p. 51, first sentence of the full paragraph on the bottom: "The ability to create of elaborate mechanical..." [Strike "of"]

p. 100: "has remained almost unchanged SINCE its invention."

p. 164, last full paragraph: "...scientists in the early twentieth century WERE most interested in..."

p. 172 first line, second word: "a square meter" should be "a cubic meter."

This definition of the kilogram is, of course, now out of date; the definition of the “second” has also been revised.

p. 169: Cesium is the LEAST electronegative.

p. 172: The newton is the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force.