Tfll' I-ACl' (M- Tfir SKY VnV^ OCTOI'.I-R 



Hv A. C. 1). CKO.MMICLIN. IJ.A., D.Sc, I'.R.A.S. 



Table 36. 



Jupiter. 



36*4 



26*3 



aS'S 



+35-3 



6-3 

 6-0 

 5-6 

 5-3 

 +4-7 



59-8 

 353-8 

 387-9 



+ 16-3 

 - 7-5 

 -31 -5 



67-3 

 97 "S 



157-7 



-25-0 

 35-0 

 35-0 

 34-9 

 34-9 



Table 37. 



P is the position angle of the North end of the body's axis measured eastward from the North Point of the disc. B, L 



are the heIio-(planeto-)graphical latitude and longitude of the centre of the disc. In the case of Jupiter Li refers to the 



equatorial zone. Lj to the temperate zones. Ti To are the times of passage of the two zero meridians across the centre of the 



disc : to find intermediate passages apply multiples of 9"" dOj™, Q* 55A" respectively. 



The letters iii. c stand for moriiinjj. cvenint,'. The day is taken as beginning at midnight. 



The Sun moves South pretty rapidly. Sunrise during 

 October changes from 5-59 to 6-53 ; sunset from 5-41 to 

 4-35. Its semi-diameter increases from 16' 0" to 16' 9". 



Mercury is in superior conjunction with the Sun on 

 October 4th, and may be seen in the evening at the end of the 

 month, especially by Southern observers. Throughout the 

 month the disc is nearly fully illuminated, semi-diameter 2i". 



Venus is an evening Star, but too near the Sun for 

 convenient observation. Illumination nearly complete, semi- 

 diameter 5'". 



The Moon.— Last Quarter 3" 8" 4S"'c ; New 10'' l''4I"V; 



First Quarter IS"" 2^ 6"'in; Full 26" 2'' 30°'m. Perigee 

 7'' 7\', semi-diameter 16' 23"; Apogee 19'' 2''e, semi-diameter 

 14' 48". Maximum Librations, October 3'' 7° S., 13" 6° W.. 

 17'' 7° N., 26" 5° E. The letters indicate the region of the 

 .Moon's limb brought into view by libration. E. W. are with 

 reference to our sk\-. not as they would appear to an observer 

 on the Moon. 



Mars is an evening Star, but practically invisible. 



Jupiter is an evening Star, increasing its distance from us. 

 so that the equatorial semi-diameter diminishes from 17" to 

 16". The Polar is smaller by l.i". The configurations of the 

 satellites at 6*'e are for an inverting telescope. 



Table 38. Occultations of stars by the Moon visible at Greenwich. 

 From New to Full disappearances occur at the Dark Limb, from Full to New reappearances. 



358 



