( 673 ) 



But tliis observational curve has to l)e corrected, owing to the 

 circumstance that in the lapse of time considered the Sun's altitude 

 has diminished. We may proceed as follows. Apart from a possible 

 influence of sun-spots or taeniae there is no reason why the eclipse 

 curve would not be symmetrical if the Sun's altitude (and the con- 

 dition of our atmosphere) remained constant. Between 23'> and 1'' 

 the variation of altitude is very small. Xow taking 0'' 53"^ 50^ as 



TABLE II. 



TABLE III. 



