THE FACE OF THE SKY FOR lUXE. 



Bv A. C. D. CKc)MMI;L1N. I>.A., D.S( 



F.K.A.S. 



Table 15. 



Table 16. 



m. c denote morning, evening 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 Helio-(planeto-)graphical 

 latitude and longitude of the centre of the disc (N. latitudes +K 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 -T"", 'j" 50-4", 9" 55 -6"" respectively. 



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



Thk Sl'n reaches his greatest North Declination (Sunnner 

 Solstice) at 7"" 17'° c on June 21st. During June the semi- 

 diameter diminishes from 15' 47"-6 to 15' 45"-4 (practically 

 the minimum). Sunrise S" 51"° on 1st, 3*' 49°" on 30th ; 

 sunsets'" 4™ on 1st, S" IS" on 30th. The chief interest now 

 is in looking for spots in high solar latitudes, heralds of the 

 new cycle. 



Mercl'RY is in superior conjunction w-ith the Sun on 

 June 17th noon. .At the beginning of the month he is a 

 morning star, disc S illuminated ; at the end an evening star, 

 T illuminated. The semi-diameter remains nearly steady at 2:i". 

 Mercurv is i" N. of Saturn June 3'' 4'';n, and i° N. of Venus 

 June 12'* 5^111. 



Venus is a morning star, approaching superior conjunction. 

 It is almost fullv illuminated, semi-diameter about 5". 



The Moon is at L. Ouar. June 8" 2" ib"";;;, New 15'' 6" 24"' in, 

 K. Ouar. 21'' S" 39°" e, Full 29"* l" 34"° e. Apogee 4'J l" e 

 (semi-diam. 14' 46"); Perigee 15" 4" e (semi-diam. 16' 36"); 

 Ma.\imum Librations 6° N. June 3'', 7= E. ll", 7° S. le". 

 7° W. 23", 7° N. 30". The letters indicate the region of 

 the Moon's Umb that is brought into view by libration ; E. VV. 

 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 Crisiuin. 



Mars is getting too far away for profitable work ; the 

 physical ephemeris in The Nautical Almanac only continues 

 up to the middle of the month. Semi-diameter 2". 



JfPITER is in opposition on June 1st, and is therefore at his 

 best position for the present year ; but his south declination is 

 unfavourable for good definition in K:ngland. Equatorial 



From New to.FuU disappearances occur at the Dark Limb, from Full to New re-appearances. 

 Table 17. Occultations of stars by the Moon visible at Greenwich. 



