The New Encyclopaedia Britannica
Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries - 934 pages
 Propaedia: outline of knowledge and guide to the Britannica.--- Micropaedia: ready reference and index.--- Macropaedia: knowledge in depth.
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Celestial longitude is measured eastward from the ascending intersection of the
ecliptic with the equator, a position known as the “first point of Aries,” and the
place of the Sun at the time of the vernal equinox around March 21. The first point
Guidance of planetary space probes demands much higher accuracy, which is
provided by radar measurements. Pulses from a powerful transmitter are beamed
to a planet, reflected waves are collected by a large radio “dish,” and the time ...
Spectrophotometric techniques can probably be used to detect and measure air
pollution. Upper-atmosphere properties are measured by a variety of ground-
based remote-sensing instruments; for example, radio waves are used to
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review