Computer Science
Scientific paper
Mar 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959natur.183..881k&link_type=abstract
Nature, Volume 183, Issue 4665, pp. 881-882 (1959).
Computer Science
11
Scientific paper
IN a recent article1 in Nature, we described how the Earth's gravitational field could be explored with the aid of satellites, and gave some results obtained from analysis of kinetheodolite observations of Sputnik 2 (1957β), the orbit of which was inclined to the equator at an angle near 65°. From observations of a single satellite, the coefficient J of the second harmonic in the Earth's gravitational potential could only be evaluated if the coefficient D of the fourth harmonic were given its conventional value of 10.6 × 10-6. On this assumption the value derived1 for J was 1626 × 10-6, corresponding to a value of 1/298.1 for the Earth's flattening (defined as the difference between equatorial and polar radii, divided by the equatorial radius), as compared with the previously accepted value2 of 1/297.1. To obtain J, and D independently, results from two satellites, of substantially different orbital inclinations, are required.
King-Hele D. G.
Merson R. H.
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