Discrepancies between Radar Data and the Lunar Ephemeris

Details Discrepancies between Radar Data and the Lunar Ephemeris Discrepancies between Radar Data and the Lunar Ephemeris

May 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968sci...160..876s&link_type=abstract

Science, Volume 160, Issue 3830, pp. 876-878

Computer Science

Scientific paper

Precise measurements of the Doppler shift of radar waves reflected from Moon disclose unexpectedly large discrepancies-averaging about 0.6 centimeter per second-between the radial velocities and the predictions based on the Eckert-Brown lunar ephemeris. These residuals have a rapidly changing component corresponding to a relatively large, variable, and un-explained discrepancy in radial acceleration of about 10-4 centimeter per second, per second, in magnitude and about 1 day in period.

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