Simultaneous Nadir Overpasses (SNOs) between GOES-16 and NPP
TLE Epoch: 2017 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2017   06:26:29   (   0.00, -75.19) (  -0.02, -75.03)   17.70                80
 12/16/2017   18:29:40   (  -0.02, -75.22) (  -0.13, -75.80)   66.39                80
 12/17/2017   18:08:14   (  -0.02, -75.22) (   0.86, -71.27)  449.82                80
 12/19/2017   06:30:01   (   0.01, -75.18) (   0.31, -76.54)  154.89                80
 12/20/2017   06:13:56   (   0.01, -75.18) (  -0.68, -72.00)  361.72                80
 12/21/2017   18:35:52   (  -0.00, -75.23) (  -0.46, -77.31)  237.81                80
 12/22/2017   18:14:27   (   0.00, -75.23) (   0.53, -72.78)  278.96                80
 12/24/2017   06:38:54   (  -0.00, -75.20) (   0.64, -78.05)  325.04                80
 12/25/2017   06:17:30   (  -0.01, -75.20) (  -0.41, -73.52)  192.25                80
 12/26/2017   18:42:05   (   0.01, -75.26) (  -0.78, -78.82)  405.84                80
 12/27/2017   18:20:39   (   0.01, -75.27) (   0.21, -74.29)  111.60                80