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)
 12/21/2017   18:35:52   (  -0.01, -75.20) (  -0.46, -77.31)  240.18                80
 12/22/2017   18:14:27   (  -0.00, -75.20) (   0.54, -72.78)  275.92                80
 12/24/2017   06:36:14   (  -0.00, -75.16) (   0.63, -78.05)  328.42                80
 12/25/2017   06:20:09   (  -0.01, -75.17) (  -0.36, -73.51)  188.27                80
 12/26/2017   18:42:05   (   0.01, -75.21) (  -0.78, -78.82)  411.45                80
 12/27/2017   18:20:40   (   0.01, -75.21) (   0.22, -74.29)  105.40                80
 12/29/2017   06:45:07   (  -0.00, -75.18) (   0.95, -79.56)  498.19                80
 12/30/2017   06:26:21   (  -0.00, -75.19) (  -0.04, -75.02)   19.00                80
 01/01/2018   18:29:31   (  -0.00, -75.24) (  -0.15, -75.78)   62.77                80
 01/02/2018   18:08:07   (  -0.00, -75.24) (   0.91, -71.26)  454.44                80