Till' I'ACI- ()!•■ rill-: SK\- l-OK Al'KlI.. 



J^^ -^^ '• !>• t'KoMMII.IN. i;..\., D.Sc, I'.R.A.S. 



Table 9. 



-26'7 —0*8 377-3 

 35-4 +0-4 239-3 



Jupiter. 



I 33' 

 48 ;« 

 ' 34' 



53-8 

 85-8 

 .17-8 



3 36c 



9 33" 



Table 10. 



Greenwich Civil Time (day beginning at midnight) is used throughout these notes: m. e are used to denote morning, 

 evening respectively. P denotes the position angle of the axis of the body measured eastward from the N. Point of the disc. 

 B IS the HeIio-(planeto-)graphical latitude of the centre of the disc. L denotes the longitude of the centre of the disc, and 

 T the ti-Jinsit of the ^ero meridian across the centre of the disc. In the case of Jupiter, Svstem I of longitude refers to the Equator, 

 System II to the 1 emperate Zones. To find intermediate values of T apply multiples of 24" jgi"", 9" 50*"". 9'' 55*"". for Mars. 

 Jupiter I. Jupiter II respectively. Q, q for Mars are the position angle and amount of the greatest defect of illumination. 



Tni-; SfN continues its rapid northward march, and by 

 .April 21st has attained half its maximum North Declination. It 

 rises at Greenwich at 5" 38"" on April 1 st, 4" J6"' on .■\pril 30th ; 

 sets at 6* 30" on April 1st, 7*' 18"" on April 30th. The semi- 

 diameter diminishes from 16' 1" to 15' 54". 



Thk Moon is Full April l*" 10" 5'"t'. L. (). 9" 3" 24"" c New 

 I7M1" 40" m, K.p. 24" 8" 47'" ;n. Full May l" lO" 19'" m. 

 Apogee April 10'' l" w, semi-diameter 14' 48"; Perigee 

 22 10" e. semi-diameter 16' 12". Greatest libration 5° W 

 April 3", 7°S 9^ 5° E 16", 7° N 23", 5° W 30". The letters 

 indicate the region of the limb (considered with reference to 

 our sky) carried into view by libration. Observers should 

 take advantage of favourable libration for studying the region 

 near the limb. 



disc eclipsed ; Last contact with shadow ll" 3" c, 235° from 

 \ Pt. to E.. last contact with penumbra Apr. 2" O" 34°" in. 

 The outer part of the penumbra has no visible effect, the 

 inner part produces a smokiness on the disc. This eclipse is 

 visible throughout Europe and Africa, in Western Asia and 

 Eastern America. 



ANNUr.AR-ToTAL ECLIPSE OF THE SUN, .\PR1I. 17TH. — 



Details of the central line across Europe of this interesting 

 eclipse were given last month. It is the largest solar eclipse 

 in the British Isles since that of March, 1858, of which it is a 

 return after the triple Saros. That was the third of three 

 annular eclipses in Great Britain at eleven-year intervals. 



The line where the magnitude is 10 of the Sun's diameter 

 runs from Cape Clear through Tipperary, Greenore, Down- 



Tahi.i: 11. Occultations of stars by the Moon visible at Greenwich. 



Partial Eclipse of Moon, .\pr,,. isT.-First contact 

 with penumbra 7" 55" e ; First contact with shadow 9" 26'" c 

 183 from N.Pl. to E., MiJ-Eclipse 10" W e, one-sixth of 



Patrick, Wigtown, Edinburgh, Fifeness. The I'^n line begins at 

 Start Point, and runs just south of Oxford and King's Lynn. 

 The largest eclipse in the British Isles occurs on the coast 



90 



