THE FACE OF THE SKY FOR JANUARY. 



By A. C. D. CKOMMELIX, V>..\.. D.Sc, F.K.A.S. 



Table 51. 



Table 52. 



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-lgraphical latitude and longitude of the 



centre of the disc. 



The letters m, e stand for morning, evening. The day is 

 taken as beginning at midnight. 



The Sun has commenced his Northward march. Sunrise 



during January changes from 8-8 to 7-44 ; sunset from 

 3-58 to 4-43. Its semi-diameter diminishes from 16' 18" to 

 16' 15". Nearest Earth, January 1st, distance 91} million 

 miles. 



Mercury is a morning star. It passed greatest elongation 

 22°-4 W. December 28th. Illumination, January 1st seven- 

 tenths, January 31st twenty-nine thirtieths. 



Venus is an evening Star, approaching its greatest elongation, 

 which it reaches on February 12th. Illumination two-thirds, 

 semi-diameter 10". 



The Moon.— New y" lO'' 2S'^m; First Quarter IS"* 4'' 2°'e ; 

 Full 22'' 3" 40°'e; Last Quarter 2'/ 7" 34'"hi. Apogee 

 11" l^m, semi-diameter 14' 44"; Perigee 23" llN», semi- 

 diameter 16' 43". Maximum Librations, P* 6° \V., 6'' 7° N., 

 17" 8° E., 20" 7° S., 29" 7° \V., February 2nd 7° N. 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. 



Table 53. Occultations of stars by the Moon visible at Greenwich. 



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



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



Special attention is called to the occultation of the first magnitude star Spica, or Alpha Virginis, on the morning of Jan. 28th. 

 The Moon will be rather low at Disappearance, but the conditions at Reappearance are pretty favourable. 



