47fi 



KNOWLEDGE. 



Dkcembf.r. lyil. 



Borri-:i.i,y's Comkt. 



Meteor Showers. — The following list of radiants for 

 January is due to Mr. \V. F. Denning. 



V.\RI.\BLE St.-\RS. — The following list gives every third 

 niiniinuin of .\lgol. Its magnitude ranges from 2-3 to 3-5. 

 Period i'' 20" 4<r. Jan. 6'' 9'V., 15'' ll"ii,.. _'4'' _'")».. Feb. 1'' 

 4V. 



,.i Lyrae ranges from 3-4 to 4-5. 



Double St.-\rs. — The period over which any double star 

 can be observed is nearly always several months, and in 

 some cases the whole year, But in order to make a distribution 

 into months. I am adopting the principle of taking those which 

 cross the meridian between 9'^ and ll'' p.m. on the 20th of each 

 month, i.e.. in January the limits of Right Ascension are a"" to 

 7'', in February 7"* to 9*^, and so on. Merely a brief selection 

 of double stars, clusters and nebulae within tliisc limits can 

 be given. 



The angle is measured from North towards East. 





I I 



• I 



n<rr. , 



J.ln. 



F.-h. ,„ 



Mar. 



FiGfRE 2. Stars near the path of Xcptune. December. I'lU. to .-\])ril. 191^ 



20 



