Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/22/2021   10:50:24   (   0.03,-137.21) (   0.97,-141.46)  484.62                80
 09/23/2021   10:34:19   (   0.03,-137.21) (  -0.03,-136.93)   31.69                80
 09/25/2021   22:34:52   (  -0.03,-137.19) (  -0.13,-137.70)   58.12                80
 09/26/2021   22:18:48   (  -0.03,-137.18) (   0.87,-133.17)  457.57                80
 09/28/2021   10:37:56   (   0.03,-137.18) (   0.30,-138.44)  143.87                80
 09/29/2021   10:21:51   (   0.02,-137.17) (  -0.71,-133.91)  371.22                80
 09/30/2021   22:41:08   (  -0.01,-137.14) (  -0.51,-139.21)  236.35                80
 10/01/2021   22:25:04   (  -0.01,-137.12) (   0.56,-134.69)  278.43                80
 10/03/2021   10:44:13   (   0.00,-137.11) (   0.62,-139.96)  324.17                80
 10/04/2021   10:28:08   (   0.00,-137.09) (  -0.39,-135.42)  190.34                80