SEPTEsrBER 1, 1898.] 



KNOWLEDGE. 



215 



in actual conjunction with the Sun on October 13th, and 

 the satellites will not be observable from September ISth 

 to November 12th. 



Saturn is still an evening star, at the middle of the 

 month remaining above the horizon for about two and a 

 half hours after the Sim has set. He is in the constellation 

 Ophiuchus, but may perhaps be better recognized from his 

 position of about six degrees north of Antares. 



Uranus passes from Libra into Scorpio, but is too tar 

 south and too near the Sun for convenient observation. 

 His path is from about one-third to one-half the distance 

 from \ Libra; to u> Scorpii. 



Neptune, still in Taurus, rises about 11 p.m. at the 

 beginning of the month, and about 9 p.m. at the end. He 

 is a httle to the north-east of ':; Tauri. 



The Moon will enter her last quarter on the 7th at 

 10.51 P.M. ; will be new on the 16th at 12.10 a.m. ; will 

 enter her first quarter on the 23rd at 2.39. a.m. ; and 

 will be full on the 29th at 11.11 p.m. At the full the 

 phenomena of the Har\-est Moon will be presented to us ; 

 that is, she will rise almost full at about the same time 

 on several successive evenings. This is illustrated in 



Fig. 1.— lUustratiDg the Risirg of the Harvest Moon. 



Fig. 1, showing the Moon's position on the celestial sphere 

 at the times of rising, from September 27th to October 

 Ist, as seen from outside. The direction of the diurnal 

 motion being indicated by the arrow, it is at once evident 

 why the times of rising vary so little. At the time of 

 setting, the ecliptic is no longer nearly coincident with the 

 horizon, as will appear from Fig. 2, and the intervals 



Fig. 2.— Illustrating the Setting of the Harvest i[oon. 



between the times of setting on successive days are longer 

 than the average. The following are the times of rising 

 and setting of the Harvest Moon at Greenwich : — 



Eises. Sets. 



September 27th ... 4.29 p.m. 2.38 a.m 



28th . . 4.47 ,, ... 4.1 



29th ... 5.4 „ ... 5.21 „ 

 30th 5.22 „ 6.41 „ 



October 1st 5.42 ., 7.59 „ 



Conveniently observable minima of Algol will occur on 

 the 12th at 11.27 p.m., and on the ISth at 8.16 p.m. 



Observers interested in variable stars may be reminded 

 that a maximum of Mira Ceti is probably not far distant. 



(lE^css <!Eolumn. 



By 0. D. LooooK, b.a. 



Commonioations for this oolomn should be addressed to 

 C. D. LococK, Burwash, Sussex, and posted on or before 

 the 10th of each month. 



Solutions of August Problems. 



(By J. Nield.i 



No. 1. 



1. Q to QB2, and mates next move. 

 No. 2. 



As pointed out by W. de P. Crousaz only, Kt to R2 will 

 not solve this problem, on account of the reply Kt to K7. 



Correct Solutions of No. 1 received from Alpha, 

 W. Clugston, H. Le .leune, G. G. Beazley, J. M'Robert. 



Mr. A. C. Challenger writes to say that the unsoundness 

 of his problem in the July number was due to the absence 

 of a White Pawn at KB2. 



If. J. Bearne.—kfiet 1. QK2ch, K to Q5, 2. Kt Kt4 is 

 not mate. 



ir. ClugUon, — July solution correct, as you will have 

 seen. 



/•'. ir. Andrew. — Thanks for the problem ; it is marked 

 to appear next month, and a copy shall be sent to you. 



./. Xi.hl. — Have posted copy as requested. Can you 

 account for the ditficulty in No. 2 '' 



A. C. Challenger. — Many thanks for the explanation. 

 The original being no longer available, it is impossible to 

 say whether the omission was there or not. Judging by 

 the number of pieces, it seems perhaps probable that the 

 omission was made as you suggest. We shall be glad to 

 receive the substitutes. 



PROBLEMS. 



No. 1. 



By B. G. Laws. 



Black (: 



White (h). 



White mates in three moves. 



