Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 8 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/29/2021   22:40:56   (  -0.05,-137.20) (  -0.51,-139.20)  228.47                80
 08/30/2021   22:24:52   (  -0.05,-137.19) (   0.54,-134.68)  287.13                80
 09/01/2021   10:46:40   (   0.04,-137.17) (   0.69,-139.93)  315.39                80
 09/02/2021   10:25:16   (   0.04,-137.16) (  -0.36,-135.41)  199.65                80
 09/03/2021   22:47:13   (  -0.03,-137.15) (  -0.82,-140.72)  406.99                80
 09/04/2021   22:31:09   (  -0.02,-137.13) (   0.18,-136.19)  107.69                80
 09/06/2021   10:50:17   (   0.01,-137.11) (   0.99,-141.46)  495.91                80
 09/07/2021   10:34:13   (   0.01,-137.09) (  -0.00,-136.92)   18.69                80
 09/09/2021   22:34:46   (  -0.01,-137.04) (  -0.17,-137.70)   74.65                80
 09/10/2021   22:18:41   (  -0.02,-137.02) (   0.83,-133.16)  439.37                80