Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 7 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/20/2018   22:40:04   (   0.22,-135.52) (  -0.58,-138.95)  391.27                80
 07/21/2018   22:24:01   (   0.21,-135.52) (   0.46,-134.42)  125.50                80
 07/23/2018   10:43:10   (  -0.24,-135.50) (   0.68,-139.70)  478.12                80
 07/24/2018   10:27:05   (  -0.23,-135.50) (  -0.29,-135.17)   38.13                80
 07/26/2018   22:27:40   (   0.24,-135.52) (   0.17,-135.96)   49.70                80
 07/27/2018   22:11:36   (   0.23,-135.51) (   1.15,-131.42)  466.34                80
 07/29/2018   10:30:45   (  -0.26,-135.48) (  -0.01,-136.70)  138.31                80
 07/30/2018   10:14:41   (  -0.25,-135.47) (  -0.98,-132.16)  377.26                80
 07/31/2018   22:33:59   (   0.27,-135.48) (  -0.17,-137.48)  227.64                80
 08/01/2018   22:17:54   (   0.26,-135.47) (   0.81,-132.94)  287.76                80
 08/03/2018   10:37:04   (  -0.29,-135.43) (   0.34,-138.22)  317.62                80