Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 8 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/22/2017   10:27:12   (   0.35,-135.05) (   0.38,-135.07)    4.18                80
 08/24/2017   22:27:46   (  -0.35,-135.07) (  -0.54,-135.85)   89.35                80
 08/25/2017   22:11:42   (  -0.35,-135.08) (   0.50,-131.33)  427.78                80
 08/27/2017   10:33:32   (   0.35,-135.09) (   0.67,-136.60)  172.16                80
 08/28/2017   10:12:07   (   0.35,-135.09) (  -0.31,-132.07)  343.76                80
 08/29/2017   22:34:04   (  -0.35,-135.08) (  -0.88,-137.37)  261.45                80
 08/30/2017   22:18:01   (  -0.34,-135.09) (   0.16,-132.85)  254.92                80
 09/01/2017   10:39:50   (   0.34,-135.10) (   1.01,-138.13)  344.95                80
 09/02/2017   10:18:27   (   0.34,-135.09) (  -0.02,-133.60)  170.23                80
 09/03/2017   22:40:23   (  -0.33,-135.06) (  -1.22,-138.90)  437.66                80