THE FACE Oh' THE SK\' 1-OR AEW 

 Bv .\. r. 1). cr().\lmi:lin, b.a., d.Sc, f.k.a.s. 



Table 12. 



Table 13. 



III. c denote tiioriiing, evenin.5 respectively. Greenwich Civil Time (day commencing at midnight) is used. P is the position 

 angle of the body's North Pole measured eastward from the North Point of the disc. B, L are the HeUo-(planeto-lgrapliical 

 latitude and longitude of the centre of the disc IN. latitudes +). In the case of Jupiter there are two systems of longitude, the 



first for the equatorial region, the second for the temperate zones. 



T denotes the time of passage of the zero meridian. Intermediate passages for Mars, Jupiter I and II may be found by 



applying multiples of 24" 39- 7"", 9" 50-4", 9" 55-6"" respectively. 



O. q for Mars are the position angle and amount of the greatest defect of illumination. 



The Sl'n continues his northward march, but with 

 slackening speed. During Mav the semi-diameter changes 

 from 15' 53"-6 to 15' 47"-8; Sunrise 4" 34°" on 1st, 3^ 52"" 

 on 31st. Sunset 7" 20" on 1st, 8" 3"" on 31st. As this is 

 probably the year of minimum, sunspots and prominences are 

 few and small. 



Mercury Is a morning star throughout the month; being 

 south of the Sun it is better placed for observers in the 

 southern hemisphere. It is in elongation 26° from Sun, 

 May 13th. The semi-diameter diminishes from 5" to 3", the 

 illuminated portion of disc increases from 1 to }. 



Venus is approaching superior conjunction, and is too 



near the Sun for convenient observation. Semi-diameter 5", 

 tVs of disc illuminated. 



The Moon is full Mav r' 10" 19" m, L. Quar. 

 9'^ 9" 56™ ;;;, New K)"" lO" 14'" c. F. (Juar. 23" 2" 11" e, 

 Full 30'' 11" 30" e. Apogee 7" s" e (semi-diam. 14' 48"); 

 Perigee 19" 5" e (semi-diam. 16' 24"); Maximum Librations 

 5° W. April 30", 7° N. May 6", 6° E. 14", 6° S. 20", 

 5° W. 26", 6° N. June 3rd. The letters indicate the region of 

 the Moon's limb that is brought into view by libration ; E. W. 

 mean the East and West with regard to our sky, not as they 

 would appear to an observer on the Moon. Thus W. is the 

 side towards Mare Crisium. 



Table 14. 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 occur of the Dark 



limb, from Full to New reappearances. .-Vttention is called to the occultation of .^ntares on the 30th. It is low down at 



disappearance, but fairly well placed for reappearance. 



