66 



DISCUSSION OF THE INFLUENCE OF THE MOON 



Table VII. — Diffeeences from the Monthly Normals, 1845. 

 Western hour angles of the moon. 



1845. 



U. cal. 

 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



ll" 



January 



February 



March 



April 



May 



June 



+1 



—2 

 



—2 

 —1 

 + 1 



+2 

 

 —1 

 —4 

 + 1 

 +1 



+2 

 —3 

 —2 

 —2 

 +2 

 +2 



+2 

 —2 



+1 

 



+1 

 



+2 

 —2 

 +1 

 —1 

 +2 

 —2 



+4 

 —2 





 —1 

 +3 







+ 1 

 



+2 

 



—2 



—1 



+ 1 

 

 +1 

 +2 

 —1 

 —1 



—2 



+1 

 —2 

 +5 

 

 —3 















+4 



+ 1 



—4 



+3 

 —1 

 +4 

 + 4 

 —1 

 —3 



+2 

 +1 

 —1 

 +2 

 

 —2 



Mean 



—0.5 



—0.2 



—0.2 



+0.3 



0.0 



+0.7 



0.0 



+0.3 



—0.2 



+0.2 



+1.0 



+0.3 



Eastern hour angle. 



L. cul. 

 1845. 1 



1 



2 



1 

 3 j 4 



5 



6 



7 



8 



9 



10 



ll" 



January 



February 



March 



April 



May 



June 





 +2 

 +4 

 —1 

 —1 

 —1 



—1 



+3 

 +2 

 + 1 

 •—1 



+1 



—5 

 +3 

 —1 



—1 



—2 







—3 1 

 +3- +2 

 +2 1 -2 

 —1 —2 

 —3 —2 

 +1 +2 



—1 

 

 +1 

 —2 

 —1 

 +1 





 

 —1 

 —1 

 —1 

 +2 



—2 

 —1 



+1 



—1 







+2 



—2 

 



—2 

 



+1 



+1 



—4 

 —1 

 —2 

 +1 

 +1 

 +3 



—3 



—2 

 —3 



+1 







+2 











—3 



+ 1 



—1 

 +3 



Mean j +0.5 



+0.9 — I.OJ —0.2, —0.3 



—0.3 



—0.2 



—0.2 



—0.3 



—0.3 



—0.9 



0.0 



Before we combine the above results of years and parts of years, it is desirable 

 to inquire into the variability of the lunar effect in summer and winter. Consider- 

 ing the months from April to September (inclusive) as summer months, and those 

 from October to March (inclusive) as winter months, and combining the differences 

 from the monthly normals in each year according to the number of observations, 

 we obtain the following results : — 



Table VIII. — Lunar-Diurnal Variation in Summer and Winter 



(Expressed in scale divisions.) 

 Western hour angles. 



1841 TO 1845 





U. cul. 

 



1 



2 3 



4 



5 1 6 



7 



8 



9 



10 



ll" 



Summer | +1.0 

 Winter —0.8 



—0.1 

 +0.8 



+0.6 

 +0.9 



+0.2 

 +0.1 



-1.0 

 +0.4 



+0.8 

 —0.6 



—0.4 

 —0.5 



—0.4 

 —0.5 



+0.1 

 0.0 



—0.1 

 +0.1 



+0.6 

 +0.4 



—1.0 

 0.0 



Eastern hour angles. 





L. cul. 

 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



ll" 



Summer 

 Winter 



—0.5 

 —0.2 



—0.8 

 +0.3 



—0.3 

 —0.9 



—0.9 

 +0.3 



-0.4 

 +0.4 



—0.4 

 +0.2 



+0.4 

 —0.5 



+0.4 

 —0.7 



+0.6 

 —0.5 



+0.6 

 0.0 



+1.1 

 —1.1 



+0.8 

 0.0 



These numbers arc sufficiently iiTcgular to indicate that we cannot hope to 

 deduce any separate results for the seasons, the ntnnber of observations (about 

 9800) being altogether insufficient. We can therefore in our general combination 



