Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 5 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/12/2021   10:45:24   (  -0.02,-137.19) (   0.55,-139.76)  292.84                80
 05/13/2021   10:24:01   (  -0.02,-137.18) (  -0.48,-135.24)  222.50                80
 05/14/2021   22:48:38   (   0.01,-137.17) (  -0.73,-140.54)  383.69                80
 05/15/2021   22:29:54   (   0.01,-137.16) (   0.25,-136.00)  131.27                80
 05/17/2021   10:51:43   (  -0.01,-137.14) (   0.90,-141.28)  471.76                80
 05/18/2021   10:30:18   (  -0.01,-137.13) (  -0.07,-136.75)   42.78                80
 05/20/2021   22:33:32   (   0.01,-137.08) (  -0.09,-137.53)   50.46                80
 05/21/2021   22:17:29   (   0.01,-137.07) (   0.94,-133.00)  463.69                80
 05/23/2021   10:39:17   (  -0.00,-137.03) (   0.27,-138.27)  140.62                80
 05/24/2021   10:17:53   (  -0.01,-137.01) (  -0.71,-133.73)  373.02                80