Tdl'. 1-ACE OF rill' SKY FOR N0\I':MI'.I:I' 



By A. C. I). ("ROMMICLIN. i'...\., D.Sc, F.R.A.S. 



Table 41. 



T.'^BLE 42. 



P is the position angle of the North t-nd 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 Jupiter Li refers to the 



equatorial zone, L.. to the temperate zones. Ti T. are the times of passage of the two zero meridians across the centre of the 



disc ; to find intermediate passages apply multiples of 9*^ 50^"°, 9"" 55^" respectively. 



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



The Sun moves South at a slackening rate. Sunrise during 

 November changes from 6-53 to 7-44 ; sunset from 4-35 to 

 3-53. Its semi-diameter increases from 16' 9" to 16' 15". 



Mercury is well placed as an evening star, especially for 

 Southern observers. On November 23rd the disc is half 

 illuminated, semi-diameter 3i". 



Venus is an evening Star, drawing away from the Siui. 

 Illumination five-sixths, semi-diameter bl". 



The Moon.— Last Quarter 2" 5" 38'"/« ; New 9'' 

 First Quarter le"" lO" 43'"c ; Full 24'' 4'' Wc. 



Perigee 



3'' !]'';». semi-diameter 16' 1 1"; .\pogee 16'' 10''»n, semi-diameter 

 14' 48"; Perigee 28'' 11'';h. semi-diameter 16' 16". Maximum 

 Librations, November 1'' 7° S., 10" 5= \V., 13'' 7" N., 22'' 5" 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 an evening Star till 5th, but practically invisible. 



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

 so that the ecjuatorial semi-diameter diminishes from 16" to 

 15J". The Polar is smaller by 1'". The configurations of the 

 satellites at 5''c are for an inverting telescope. (See Table 44.) 



Table 43. Occultations of stars by the Moon visible at Greenwich. 

 P'rom New to Full disappearances occur at the Dark Limb, from Full to New reappe;vrances. 



386 



