Simultaneous Nadir Overpasses (SNOs) between GOES-16 and NPP
TLE Epoch: 2021 9 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2021   06:24:17   (  -0.12, -75.22) (  -0.17, -75.11)   13.50                80
 09/22/2021   18:27:29   (   0.12, -75.25) (   0.01, -75.88)   71.95                80
 09/23/2021   18:11:25   (   0.12, -75.26) (   1.01, -71.35)  446.02                80
 09/25/2021   06:33:13   (  -0.12, -75.29) (   0.16, -76.62)  151.73                80
 09/26/2021   06:11:49   (  -0.12, -75.30) (  -0.84, -72.09)  366.15                80
 09/27/2021   18:36:26   (   0.12, -75.32) (  -0.32, -77.40)  235.89                80
 09/28/2021   18:15:02   (   0.13, -75.34) (   0.69, -72.87)  282.33                80
 09/30/2021   06:39:30   (  -0.12, -75.37) (   0.49, -78.14)  314.59                80
 10/01/2021   06:18:05   (  -0.13, -75.39) (  -0.52, -73.60)  203.65                80
 10/02/2021   18:42:43   (   0.13, -75.42) (  -0.63, -78.91)  397.75                80