Q:  What is the depth of the primary eclipse?  Express it as
          the fraction of the light which is blocked.


          Since intensity drops to about 63% of the original value,
          the depth is

                 primary depth  =  100% - 63%  =  37%




  Q:  What is the depth of the secondary eclipse?

                 secondary depth  =  100% - 83%  =  17%