Results 1-3 of 43
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. ... waves are collected by a large radio “dish,”
and the time delay (light time for the double journey) is very accurately measured.
ment the distribution of water vapour and aerosol can be measured; and acoustic
echo-sounding may be applied to remote measurement of wind and turbulence
by using natural small-scale temperature fluctuations as tracers.
What people are saying - Write a review
LibraryThing ReviewUser Review - keylawk - LibraryThing
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