182 



THE NATURE STUDY COURSE. 



has the same designation as that of the observer, e.g., the 

 zenith-parallel at London is 43 d , at Toronto 43°40', at Halifax 

 44°39', at Winnipeg 49°53\ 



Longitude, called right ascension, is measured either in 

 degrees or circular hours, from the meridian drawn from the 

 North Star through the point on the equator where the sun 

 crosses at the vernal equinox, on or near the 21st of March. 

 Twenty -four equidistant meridians, numbered from the initial 

 one as they pass overhead from the east, mark the sky off 

 into that many meridional regions. The initial one, No. or 

 24, passes near the outer star of the sharp V of the Big W ; 

 No. 12 passes near the middle star of the Big Dipper. The 

 meridians at right angles to these, No. 6 and No. 18, can 

 easily be imagined, and these four mark the sky off into four 

 quarters, which can be learned by pupils in the higher grades. 







Bi£W * 



18- 



Vega 



*■ 



Big 



* 



Pole Star 



**3Kids 



Capella 



6 



Dipper 



12 



Begirt Observation with Ursa Major, Polaris and Cassiopeia. 

 The best group of stars to begin with is tho Bic Dipper. 



