Tfll- l-ACI' ()!• Till- SK\- l-()U MARCH 



\W A. (. I>. I K( »MMI.I.IN. l;..\.. D.s... l.K..\.>. 



Table 6. 



jiiiiig fcspectivcl) 



Table 7. 



(;rei--iiuicli Civil 



Time is used througlioul. the day commencing 



III. e denote morning and 

 at midnight. 



P is the position angle of tin; Inidy's North Pole, measured eastward from the North point of tlie disc. B, L are the 

 Heliographical or Phinetographical latitude and longitude of the centre of the disc. In the case of Jupiter there are two 

 systems of longitude, one for the Equator the other for the Temperate /ones. 



T denotes the time of passage of the zero mcMidian across the centre of the disc. Intermediate passages for Jupiter may 

 be found by applyhig nuiltiples of 9'' SOA™, 9'' 55A'" for the two systems; for Mars apply multiples of S-T" 39". 



O. (| for i\Iars are the position angle and amount of the greatest defect of illumination. 



The Sun crosses the Equator and Spring commences at 

 lli''<;on March 20th. Its semi-diameter diminishes during 

 the month from 16' 10" to 16' 2". At Greenwich it rises at 

 6" 48"". sets at 5" 37"" on Marcli 1st; rises at a" 40'". sets at 

 e*" 29"" on March 31st. 



27, 7° S. ; .April 3. 5 W. The letter indicates the direction 

 on the limb of the region brought into view. E. \V. are 

 towards Mare Hnniorum and Mare Crisium respectively. 



Mercury is too near the Sua to be seen at the beginning 

 of the month, but is well placed as an evening star at the end 



From New to I-'uU the Disappearances take place at the Dark Limb, from Full to New the Reappearances do so. 

 Table 8. Occultations of stars bv the Moon visible at Greenwich. 



The Moon is Full Match 3"' lo" 42'" 111 : Last C).. 

 10'' 7'' 56'" f; New. IS*" lO" 9™ c; Fir.st y.. 26*' 3" 2'" 111. 

 Apogee li'' 5'' HI (semi-diameter 14' 46"). Perigee 28'' 9" f 

 (senii-diaineter 16' 15"). Maxinnim Libi-ations : Feb. 29, 7' S. ; 

 March 6, 6° W.; March 13, 7" N. ; March 21. 5" E. ; March 



of it. Its semi-diainctcr increases from 2'" to 4". The 

 fraction of disc illuminated diminishes from 1 -0 to 0-3. 



Venus is a morning star, badly placed for Northern 

 observers. Its semi-diameter diminishes frotn 6}'' to 55'', 

 fraction of disc illuminated increases from ,5 to I'o. 



60 



