Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/15/2021   22:49:01   (  -0.01,-137.20) (  -0.76,-140.60)  387.50                80
 06/16/2021   22:27:36   (  -0.01,-137.20) (   0.21,-136.06)  128.48                80
 06/18/2021   10:52:06   (   0.02,-137.20) (   0.96,-141.34)  472.28                80
 06/19/2021   10:30:42   (   0.01,-137.19) (  -0.07,-136.81)   43.24                80
 06/21/2021   22:36:36   (  -0.01,-137.17) (  -0.10,-137.59)   48.32                80
 06/22/2021   22:15:13   (   0.00,-137.16) (   0.94,-133.07)  466.37                80
 06/24/2021   10:39:42   (  -0.01,-137.14) (   0.23,-138.35)  136.55                80
 06/25/2021   10:18:17   (  -0.01,-137.13) (  -0.74,-133.81)  377.78                80
 06/26/2021   22:40:15   (   0.01,-137.09) (  -0.45,-139.11)  230.36                80
 06/27/2021   22:24:11   (   0.01,-137.08) (   0.58,-134.59)  283.92                80