Mathematics – Logic
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jbaa...95...16s&link_type=abstract
Journal of the British Astronomical Association, vol.95, no.1, p.16-21
Mathematics
Logic
Eclipses: Lunar
Scientific paper
A large number of observations made by amateur astronomers in the Southern Hemisphere for ten lunar eclipses since 1974 are summarised and a method of analysis to determine the size and shape of the umbra is described. Comparison is made with a similar programme conducted by "Sky and Telescope" and comments forwarded by Jean Meeus on the methods used for reduction of these observations are also discussed. The analysis of 1,554 crater timings contributed provides values of umbra enlargement and oblateness which are used to assess observer variability and associated physiological factors. The primary aims of this paper are to describe the many results possible, to encourage a greater number of observers and hopefully to combine the BAA, "Sky and Telescope" and Southern Hemisphere programmes to pool observations and centralise reductions.
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