Examination into error of Watts' datum and re-computation of moon's position.
The error in the datum of Watts' lunar charts (Watts,1963) is examined in detail using the lunar occultation observation data obtained in the years 1981 to 1990 and collected and reduced by International Lunar Occultation Centre (ILOC). Based on the result, a table giving the values of the datum error for arbitrary libration arguments l and b and for arbitrary axis angle II is presented so as to be applied to any positional observation of the Moon. Applying the correction for the error to the determination of the coordinates of the Moon by the lunar occultation observation, the yearly deviations ofΔλandΔβ are considerably lessened compared with the former analyses to give more accurate observed values for the longitude and latitude of the Moon. Further, fitting a quadratic to the yearly values ofΔλ’s,a difference of -0 . 35”cy in the mean motion of the Moon from the current ephemeris is found, while no significant difference in the acceleration term is detected. Key words: Lunar occultation, Ephemeris of the Moon.
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1994
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| Online Access: | http://hdl.handle.net/1834/16026 |
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