July, 1913. 



KNOWLEDGE. 



251 



Mars is a morning Star, semi-diameter 3$", defect of 

 illumination nearly a second. It is 1° North of Saturn, 

 24 d 5 h e. It will reach Opposition early in January, so the 

 season of observation is commencing. 



Vesta is in opposition August 4th, magnitude 6-1. 

 Ephemeris for midnight : — 



R.A. S.Dec. 



h ra o 



August 2 20 59-3 ... 23-2 



8 20 53-6 ... 24-0 



14 20 48-1 ... 24-6 



20 20 43-1 ... 25-1 



It will be interesting to compare it with Uranus, which is 

 not far distant. Their magnitude is about the same, but their 

 aspect different. 



Jupiter was in opposition on July 5th. Polar semi-diameter, 

 20V' in mid-August. 



Table 50. 



E., h 35 m 53 8 m III. Ec. R., l h 9 m m I. Sh. E„ 10 h 26 m 51'e 

 I. Ec. R. ; 5 d h 33 m «i II. Tr. E. ; 6 d ll h m 52 8 e II. Ec. R. ; 

 7 d 10 h 15 m c III. Oc. D., 10 h 34 m e IV. Sh. E. ; 8 d h m w I. 

 Tr. I., h 46 ra m I. Sh. I., 9" 18 m e I. Oc. D. ; 9 d h 21 m 36"m 

 I. Ec. R., 8 h 44 m c I. Tr. E., 9 h 33 m e I. Sh. E. ; 13 d 9 h 3 m e II. 

 Oc. D. ; 15 d 8 h 19 m e IV. Oc. D., 8 h 42 m e II. Sh. E.. ll h 6 m e I. 

 Oc. D., ll h 14 m c IV. Oc. R.; 16 d 8 h 14 m e I. Tr. I., 9 h 10 m e I. 

 Sh. I., 10 b 32 m e I.Tr. E.,.ll b 28 m e I. Sh. E. ; 17 d 8 h 45 m 8'e I. 

 Ec. R.; 18 d 10" 30 m e III. Sh. E. ; 20 d ll h 25 ra c II. Oc. D., 

 22 d 8 h 27 m e II. Sh. I.. 9 h 15 m e II. Tr. E., ll h 18""e II. Sh. E. ; 

 23 d 10" 3 m c I. Tr. I., ll h 5 m e I.Sh. I.; 24 d h 21 ra /« I. Tr. E., 

 7" 21"V I. Oc. D., 10 h 40 m 2*e I. Ec. R. ; 25 d 7 b 53 m c I. Sh. E., 

 10" 8"« III. Tr. E., ll h 9"V III. Sh. I. ; 29 d 8 h 49 m e II. Tr. I., 

 ll h 2 m c II. Sh. I., ll h 39°'e II. Tr. E., 30 d ll h 53 m e I.Tr. I.; 

 31 d 8 h 12 m 5V II. Ec. R„ 9 h ll m e I. Oc. D. 



Meteor Showers (from Mr. Denning's List) : — 



Configuration at 9 h 30 m e for an inverting telescope. 

 Satellite phenomena visible at Greenwich, l d h 31 m m I. Tr. 



The Perseids may be seen from July 19th, radiant 23° + 52° 

 advancing 1° per day in R.A. 



Table 51. Non-Algol Stars. 



Lyrae minima Aug. 10 d 7 h ra, 23 d 4 h m, Period 12 d 21 -8 1 ' . 

 Algol minima Aug. 8 J 4 h 51 m «», 13 d 10 h 29"V, 31 d 3 h 22 m w, Period 2 d 20-8 h . 



