Simultaneous Nadir Overpasses (SNOs) between GOES-16 and NPP
TLE Epoch: 2017 12 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/24/2017   06:36:14   (   0.00, -75.16) (   0.64, -78.04)  328.30                80
 12/25/2017   06:20:09   (  -0.01, -75.17) (  -0.35, -73.51)  188.61                80
 12/26/2017   18:42:05   (   0.02, -75.22) (  -0.78, -78.82)  410.73                80
 12/27/2017   18:20:39   (   0.02, -75.22) (   0.21, -74.28)  106.62                80
 12/29/2017   06:45:06   (   0.02, -75.20) (   1.02, -79.54)  495.48                80
 12/30/2017   06:26:21   (   0.02, -75.21) (  -0.03, -75.02)   22.25                80
 01/01/2018   18:29:31   (  -0.02, -75.27) (  -0.16, -75.78)   58.88                80
 01/02/2018   18:08:07   (  -0.02, -75.28) (   0.90, -71.26)  458.85                80
 01/04/2018   06:32:34   (   0.01, -75.26) (   0.27, -76.53)  143.49                80
 01/05/2018   06:11:08   (   0.00, -75.28) (  -0.72, -71.99)  374.63                80