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On Certain Meteor olosrical Coincidences. 



3 



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tend altogether from June, 1840, to June, IS45^ inclnsive; compre- 

 hending 02 entire lunations or 248 epochs of possible coincidence. 



These were not only daily observations, but for the greater 

 part lioiirly observations even, of various particulars interesting to 

 meterology. Of these, all that have been taken into account at 

 present are those that relate to the aspect of the sky and character 

 of the clouds ; the density, moisture, temperature, etc.j of the 

 atmosphere, which bear only collaterally upon the point in ques- 

 tion, may be as yet pretermitted. 



A part o.f the time, the observations were not at such short in- 

 tCiTvals; and for four ujionihs in 1843, they were irregular. Also, 

 durihg the whole series, observations were systematically omitted 

 on Sundays: which day of the week, however, was of course 

 sometimes the term-day and sometimes the quarter-day of a par- 

 tict^lar lunation. Owing to these circumstances, the series, for the 

 purpose of this comparison, comes to be grouped as follows, viz: 



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(a) 



(0 

 (cZ) 



81 lunatious; in which all the days are given; 



12 



6 

 1 



1 



4 



do. 

 do, 

 do. 

 do, 

 do. 

 do. 



in which one quarter-day is mi-^pcd ; 

 do. two quarter-days are missed ; 



do. three do. 



do. four do, 



in which the term-day is missed; 

 in whicli observations were not regular. 



62 hmations; covered by the series. Excluding the last three groups 



of . . ,12 lunations, we have left 



50 lunatious, suitable for comparison and whose results are given here. 



The method used in this comparison is much more stringent 

 than in the observations upon which the supposed rule origirially 

 reposed. In these last, the range of the entire day (i. e., day- 

 light) was allowed to verify the coincidences without respect 

 to the precise hour of the day when the change of Moon oc- 

 curred. And the same range (or looseness, if any one prefers to 

 term it so) might even have been admitted now. But I preferred, 

 for various reasons which need not be dwelt on, to observe the 

 coincidences at tlie precise hours of change. The following ex- 

 tract from the note book in which the comparisons. were copied 

 from the printed Girard observations, and where, close together, 

 come one of the accordant cases, and one of the most discordant, 

 will exemplify, better than any descriptionj the mode pursued. 



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Date. 



Epoch. 



1843, Mav 27, 



' 29, 

 June 5, 



19. 



July 25, 



27. 



Aug. 2, 



9, llh. A 

 18, 2h.M 



2h. M- Term-day, 

 2h. M. 

 9h. M. 



2h. A. 



3b. A.{ O 



Term-Jay, 

 Ih. M.; Term-day, 



lh.M. 



6h, A. 



Sky covered 

 lOths, 



1-0 

 10 



10 



0-7 



CloutU, etc. 



BeftM, 



D 



0-9 

 0-3 

 10 



0-3 



^1., ruiniii:^. 

 N"., rainin*^, 

 Ci-cti., Cu. 

 Cu-8. 

 Cu. 



accord* t d iscord't . 



Hazy, Cu. 

 !s. at hor. 

 Cu-a, Cu. 

 Ci., Ci-cu^ Ci-3., S. 

 Clear. 



missed. 



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accord't. 



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