38 MEMORIE DELLA SOCIETÀ' 



ter that 1 obtained the angular distances between the centre of. the sun, and the 

 moon aud with the apparent radii of the moon and the snn 1 calcnlated the fol- 

 lowing times for the Eclipse. 



Uommencement of the Eclipse 



23" 



57 m 



40 s 6 Camorta M.T. 5 aprii 



Commeucement of total ity 



1 



22 



14 7 



6 aprii 



End of totality 



1 



26 



44 9 



» 



End of the Eclipse 



2 



47 



20 7 



» 



Duration of totality 







4 



30 2 



* 



Duration of the Eclipse 



2 



49 



40 1 



» 



For the angles of position I constructed a figure thus deriving it graphically 

 and I obtained : 



First contact at 136° 40' frora the Nort point toward W. 

 Second 302 50 » » 



Third 146 45 



Fourth 312 40 



and as it was recommended in the instructions to study the spectra of the cusps 

 before and after totality , I obtained by another graphic construction the angles 

 of position of the extremities of the different phases corresponding to certain ti- 

 mes before and after totality in sucb a manuer that the slit of the spectroscope 

 could be adapted easily as a tangent or normal to these point at the will of the 

 observer. 



The following is the series of thise angles 



BEFORE TOTALITY 



M. T. 



h 3 38 

 » 13 38 



Upper Cusp Lower Cusp 



115° 

 100 



159° 

 173 



23 38 



89 



183 



33 38 



80 



191 



43 38 



72 



200 



53 38 



62 



208 



3 38 



53 



217 



13 38 



40 



228 



18 38 



25 



241 



21 38 



2 



257 





AFTER TOTALITÀ 





M. T. 



Upper Cusp 



Lower Cusp 



l h 28 38 



77° 



201 



» 33 38 



53; 



219 



» 43 38 



38 



232 



» 53 38 



28 



241 



2 3 38 



19 



250 



» 13 3$ 



10 



259 



» 23 38 



359 



268 



» 33 38 



347 



278: 



> 43 38 



330 



295 



