β Scribed by Xu Huaguan; Jin Wenjing; Huang Chengli
No coin nor oath required. For personal study only.
Lunar Laser Ranging data covering the interval from August 1969 to December 1987 were used to determine the seculer acceleration in the mean longitude of the Moon (12). In our analysis, the DE200/LE200 planets and lunar ephemerides were adopted for calculating the theoretical distance between the observing station and reflector. The method of stepwise regression was used in the processing of the data and the value of -25".4 * O".l/cy* was obtained by a weighted least squares fit.
Our result is in good agreement with that derived by other authors using various methods. The uncertainty I estimated from LLR data would be decreasing rapidly with increasing the data span. The high precision obtained in this paper is mainly due to the longer span and higher measuring accuracy of data.
π SIMILAR VOLUMES
Information about the structure of lunar interior and evolution could be obtained from measurements of lunar free librations, gravitational field, dissipation etc.. In this paper the precision of determining free librations with Lunar Laser Ranging (LLR) data are estimated. Using the observing data