Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/25/2021   10:18:17   (   0.01,-137.20) (  -0.73,-133.80)  386.85                80
 06/26/2021   22:42:55   (  -0.01,-137.19) (  -0.47,-139.11)  218.94                80
 06/27/2021   22:21:31   (  -0.01,-137.19) (   0.56,-134.58)  296.92                80
 06/29/2021   10:46:00   (   0.02,-137.19) (   0.61,-139.86)  303.63                80
 06/30/2021   10:24:37   (   0.01,-137.19) (  -0.43,-135.33)  212.09                80
 07/01/2021   22:46:34   (  -0.02,-137.18) (  -0.77,-140.64)  394.08                80
 07/02/2021   22:30:30   (  -0.01,-137.17) (   0.21,-136.10)  121.46                80
 07/04/2021   10:52:19   (   0.01,-137.17) (   0.96,-141.38)  479.86                80
 07/05/2021   10:30:56   (   0.00,-137.16) (  -0.07,-136.85)   35.06                80
 07/07/2021   22:34:09   (   0.01,-137.12) (  -0.09,-137.64)   58.21                80
 07/08/2021   22:18:05   (   0.01,-137.11) (   0.89,-133.10)  456.27                80