Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/22/2021   22:15:12   (  -0.01,-137.19) (   0.91,-133.06)  470.51                80
 06/24/2021   10:39:41   (   0.01,-137.20) (   0.26,-138.34)  130.04                80
 06/25/2021   10:18:18   (  -0.00,-137.19) (  -0.77,-133.81)  385.48                80
 06/26/2021   22:42:55   (   0.00,-137.18) (  -0.42,-139.12)  220.92                80
 06/27/2021   22:24:12   (   0.00,-137.17) (   0.61,-134.59)  294.69                80
 06/29/2021   10:46:00   (   0.00,-137.17) (   0.62,-139.86)  306.14                80
 06/30/2021   10:24:37   (   0.00,-137.17) (  -0.41,-135.33)  209.36                80
 07/01/2021   22:46:34   (  -0.00,-137.15) (  -0.78,-140.64)  397.33                80
 07/02/2021   22:30:31   (  -0.00,-137.14) (   0.26,-136.11)  118.00                80
 07/04/2021   10:52:19   (  -0.00,-137.14) (   0.97,-141.38)  483.58                80
 07/05/2021   10:30:55   (  -0.01,-137.13) (  -0.06,-136.85)   31.18                80