THE FACE OF THE SKY FOR OCTOBER. 



By A. C. D. CROMMELIN, B.A., D.Sc, F.R.A.S. 



Table 60. 



Date. 



Oct. 



Greenwich 

 Noon. 



Moon. 

 R.A. Dec. 



h. m. o 



14 28-3 S. 18-7 



19 23.4 S. 26*9 



23 19-0 S. 5'o 



2 59'2 N.21-4 



7 41-7 N.26'o 



12 1 3 "8 S. 2*5 



Mercury. 

 R.A. Dec. 



li. m. 

 ■3 IS'5 



13 44'2 



14 12-4 

 14 40*0 

 '5 7'i 



S. 8-o 

 11 4 

 14-6 

 '7'4 

 9' 



'5 33'° S.2I-8 



Mars. 

 R.A. Dec. 



6 38-2N.23'5 

 6 48-5 23-5 



6 58-2 23-4 



7 7'3 =3'3 

 7 15-8 23-2 

 7 23-4N. 23-2 



Jupiter. 

 R.A. Dec. 



h. m. 

 18 40*2 

 18 42*2 

 18 44-5 

 18 47-1 

 18 49-9 



S.23'4 



23-4 

 23-3 



23'3 

 23-2 



53-0 S.23 



Saturn. 

 R.A. De 



9*2 N.2I - 2 

 9'I 2I"2 



8"7 21*2 



8'2 2I'2 



7*4 2 1*2 



6*5 N.2I'I 



Neptune. 

 R.A. Dec. 



o'o 



0-7 

 0-9 



I'O 



N.20-1 

 20 'I 

 20'I 

 20*1 

 20*I 



N.20'I 



Table 61. 



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 helio-(planeto-)graphical latitude and longitude of the centre of the disc. In the case of Mars, T is the time of 

 passage of Fastigium Aryn across the centre of the disc. In the case of Jupiter, h ± refers to the equatorial zone; L 2 to 

 the temperate zones; Ti, T 2 are the times of passage of the twozero meridians across the centre of the disc; to find inter- 

 mediate passages apply multiples of 9 h 50j m , 9 h 55\ m respectively. 

 The letters m, e, stand for morning, evening. The day is taken as beginning at midnight. 

 The asterisk indicates the day following that given in the date column. 



The Sun continues his Southward march, but with slacken- 

 ing speed. Sunrise during October changes from 6.1 to 6.53, 

 sunset from 5.39 to 4.35. Its semi-diameter increases from 

 16' 0" to 16' 9". Outbreaks of spots in high latitudes should 

 be watched for. 



Mercury is an evening star. It reaches greatest elongation 

 (23i° E) on November 2nd, but, being South of Sun, is not 

 well placed for observation by Northern observers. Illumina- 

 tion diminishes from Full to %. Semi-diameter increases 

 from 2i" to 3". 



VENUS is a morning star, rising 3 hours before the Sun. 

 Semi-diameter diminishes from 6" to 5i". At beginning of 

 month f of disc is illuminated ; at end of month A- Being 



North of Sun it is favourably placed for Northern observers. 



The Moon.— First Quarter 7 d l h 46 m m ; Full 15 d 6 h 7 m m ; 

 Last Quarter 22 d 10" 53 ra e. New 29 d 2 h 29 m e. Apogee 

 12 d 3 h e, semi-diameter 14' 44". Perigee 28 d 4 h m, semi- 

 diameter 16' 36". Maximum Librations, 5 d 8° W, 5 d 7° N, 

 20 d 7" S., 21 d 6° E. The letters indicate the region of the 

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

 reference to our sky, not as they would appear to an 

 observer on the Moon. 



Mars is a morning Star, in Gemini, semi - diameter 

 4i", defect of illumination over a second. It will reach 

 Opposition early in January, so the season of observation 

 is beginning. The North Pole is now turned towards us. 



Table 62. Occupations of stars by the Moon visible at Greenwich. 



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

 The asterisk indicates the day following that given in the date column. 



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