THE FACE OF THE SKY FOR JUNE. 



Bv A. C. D. CKOMMELIN, B.A., D.Sc, F.R.A.S. 



Table 31. 



Table 32. 



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 Jupiter, L ± refers to the 



equatorial zone ; L 2 to the temperate zone ; Ti, T 2 are the times of passage of the two zero meridians across the centre of the 



disc ; to find intermediate passages apply multiples of 9 h 50i m , 9 h 55l m respectively. 



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



The Sun continues his Northward march till l h ;» on 

 22nd, when the Summer Solstice occurs. Sunrise during 

 June changes from 3-51 to 3-49; sunset from 8-3 to 8-18. 

 Its semi-diameter diminishes from 15' 48" to 15' 45". Out- 

 breaks of spots in high latitudes should be watched for. 



Mercury is in superior conjunction with Sun at beginning 

 of month, then an evening star, reaching East Elongation on 

 July 7th. Illumination full on 1st, one-half on 30th. Semi- 

 diameter increases from 2\" to 3i". 



Venus is a morning star, at greatest brilliancy at beginning 

 of month, reaches West Elongation July 4th. 4J South of 



Moon on 1st. Semi-diameter diminishes from 19" to 12". 

 At beginning of month 0-3 of disc is illuminated, at end of 

 month one-half. Being south of Sun, it is less well placed 

 for Northern observers than it was as an evening star. 



The Moon.— New 4 d 7 h 57 m e; First Ouarter ll d 4 h 37 m e ; 

 Full 18 d 5 h 54 m e; Last Quarter 26 d 5 h 41 m e. Perigee 

 10 d 4 h m, semi-diameter 16' 12". Apogee 25 d 3 h m, semi- 

 diameter 14' 48". Maximum Librations, 3 d 5° E, 6 d 7° S., 

 18 d 5° W., 18 d 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 33. Occultations of stars by the Moon visible at Greenwich. 



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



177 



