106 



SYDNEY CHAPMAN, B.A., D.SC, F.ll.A.S., ON 





1 





Equivalent Light of 

 Stars. 





! Nunilier of 

 j Stars of each 

 1 Magnitude. 



j 



lotfii iNuniuer 



of Stars to 

 Magnitude m. 







Magnitude-. 



Equivalent 

 Numbei" of 



1 ftf IVTn frnif nrip 



Stars. 



Totals to 

 Magnitude 



— - 



- 1-6 







Sirius 



1 



11 



11 



- 0-9 



Canopu s 



2 



6 



17 



- 0-0 



a Centauii 



3 



2 



19 



m m 

 0*0 — 1*0 



8 



11 



14 



33 



1-0 — 2*0 





38 



17 



50 



2-0— 3-0 



73 



111 



18 



68 



3-0 — 4*0 



189 



300 



19 



87 



4*0 — 5"0 



650 



950 



26 



113 



5*0 — 6'0 



2,200 



3,150 



35 



148 



6*0— 7'0 



6,660 



9,810 



42 



190 



7"0 — 8'0 



22,550 



32,360 



56 



246 



8 0 — 9*0 



65,000 



97,400 



65 



311 



9-0 — 10-0 



174,000 



272,000 



69 



380 



10*0 — 11*0 



426,000 



698,000 



68 



448 



11*0 — 12-0 



961,000 



1,660,000 



60 



508 



12-0— 13-0 



2,020,000 



3,680,000 



51 



559 



13-0 — 14-0 



3,960,000 



7,640,000 



40 



599 



14'0 — 15-0 



7,820,000 



15,460,000 



31 



630 



15 6—16-0 



14,040,000 



29,500,000 



22 



652 



16-0— 17-0 



25,400,000 



54,900,000 



16 



668 



17-0— 18-0 



38,400,000 



93,300,000 



10 



678 



18-0- 19-0 



54,600,000 



148,000,000 



6 



684 



190-20-0 



76,000,000 



224,000,000 



3 



687 





All stars fainter than 20"'-0 



3 



690 



