Febru.^ry, 1912. 



kxo\vli:dge. 



Mars is an evening star, but its disc is very small : the 

 seini-dianieter diminishes from J?" to 3". It is 3° S. of /i Tauri 

 on March 19th. 



Jl'PiTER is a morning star. Its polar semi-diameter 

 increases from 17" to 1ST', the eiiiiatorial is Ij" greater. The 

 defect of illumination is 1". The confirmations of the satellites 

 as seen with an inverting telescope at 4'' in are 



Phenomena visible at Greenwich: — 2* 4'' 0'" I. Sli. I. 

 5" 15'" I. Tr. I.. 6" 12"" I. Sh. E. ; 3" 4" 17"' III. Oc. 1). 

 4" 47"" I. Oc. R. 6'" 13'" III. Oc. K; 4"' 4" 55"' II. Sh. I : 

 6'' 4" IS'" II. Oc. R; g*" 5" 53" I. Sh. I; lO*" 3" 14'" 27' 



I. Kc. I), 3" 16" 57" III. Ec. D, 4" 58'" 57' III. Ec. R; 



,,,1 ^h 3^m J g)^ g^ 3h ^gm J -j-j. g . J3d jh ^(jm j g» 



II. Ec. D; 15'' 1" 58"" II. Tr. E; 17" 5*' 7" 51' I. Ec. 1): 

 IS'' 2" 14'" I. Sh. I, 3" 29"^ I. Tr. I, 4" 27"" I. Sh. I-., 

 5" 42'" I. Tr. E.; ig"* i^ 1"" I. Oc. K. : 20'' 4" 19"' 52- II. Ec. 

 n.: 21'' l*" 52"' III. Tr. I.. S^ 47'" III. Tr. E. : 22'' l" 51'" II. 

 Tr. I.. 2^ 1"' II. Sh. E., 4" 29" II. Tr. E. : 25" 4" 7™ I Sh. I.. 

 5" 19'" I. Tr. I. ; 26" l" 29" 37" I. Ec. I)., 4" 52"" I. Oc. R. : 

 27" 0" 48"' I. Sh. E., 2" 0" I. Tr. E. : 28" O" 51" III. Sh. I.. 

 2'' 50'" III. Sh. E., 5" 38" III. Tr. I.; 29" l" 57"' II. Sh. 1.. 

 4" 20'" II. Tr. I.. 4" 36" II. Sh. E. ; 31" l" 5" 11. Oc. K. .Ml 

 these phenomena are in the morning hours. .Attention is 

 drawn to the almost simultaneous eclipses of 1. and III. on tlic 

 loth. The eclipses occur high left of the disc in the inverted 

 image, taking the direction of the belts as horizontal. 



Satlkn isan evening star,dra\ving near the Sun. Equatorial 

 semi-diameter 8i"; major axis of ring 39J", minor 14A". The 

 times of some Eastern elongations of the Satellites are given ; 

 intermediate ones are found bv applving multiples of l" 21'" 

 for Tethys. 2'' 1 x" f..r ni.-ne. Tethys J" 4" m, 8" 8" c. 14'' iiooii^ 



18" 7'' III ; Dione Z' S'' e, 8'' 8" m, 13" 7" c. 16" 1" c ; Rhea 4" 4'' m, 

 8" 5" e. 1 3" 5'' m. For Titan and lapetus E., W.. stand for E. 

 and W. Elongations: I.S. for Inferior and Superior Coniunc- 



w .^ t. ... .. .... 1 >j. 1 uan ana lapeius c., v\ ., siana lor 1-,. 



and W. Elongations: I.S. for Inferior and Superior Conjunc- 

 tions. Titan 5" 7" m 1, 9"4''m \V, 13"2''m S. 17" 6'' hi E; 

 lapetus 16''8'';jj E. 



Uranus is a morning star, but very badly placed. Semi- 

 diameter If. 



NiiPTLJ.xiv is well placed as an evening star ; semi-diameter 

 1 1". A map of its course was given in " KNOWi.iiDGi; " for 

 December last. 



CoMliTS. — Elements of Comet L 1911, discovered by 

 M. Scliauniasse at Nice, im November 30th. 



T =' 1912, Feb. 5-34, G.M.T. 

 u - 109° 7'-6 

 Si = 115° 12'- 1 

 ( = 20° 29' -4 

 log (J ^ 0-06822 

 Ephemeris for Paris midnight : — 



The comet is brightest at the end of January, but is then of 

 only the 10th magnitude. It is a morning .star. 



Mi:teoks. — The following list of showers is due to Mr. 

 W. F. Denning. 



Every Third Minmmum of Ai.goi. (Period 2" 20*" 46'") 

 March l" TO" 16" m, 10'' O" 43" ;;;. 18'' 3" 9" e. 27'' .5" 36"/i(. 



