Simultaneous Nadir Overpasses (SNOs) between GOES-16 and NPP
TLE Epoch: 2017 12 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/20/2017   06:13:56   (   0.02, -75.17) (  -0.68, -72.00)  360.96                80
 12/21/2017   18:35:52   (  -0.00, -75.21) (  -0.46, -77.31)  239.29                80
 12/22/2017   18:14:27   (   0.01, -75.21) (   0.53, -72.78)  277.12                80
 12/24/2017   06:36:14   (  -0.01, -75.18) (   0.64, -78.05)  327.26                80
 12/25/2017   06:20:10   (  -0.01, -75.18) (  -0.41, -73.52)  189.77                80
 12/26/2017   18:42:05   (   0.01, -75.23) (  -0.78, -78.82)  408.91                80
 12/27/2017   18:20:39   (   0.02, -75.24) (   0.21, -74.28)  108.27                80
 12/29/2017   06:45:07   (  -0.01, -75.21) (   0.96, -79.55)  495.41                80
 12/30/2017   06:26:21   (  -0.01, -75.22) (  -0.03, -75.02)   22.16                80
 01/01/2018   18:29:32   (  -0.00, -75.28) (  -0.10, -75.80)   58.27                80
 01/02/2018   18:08:07   (   0.00, -75.29) (   0.90, -71.26)  459.25                80