Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 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)
 04/22/2021   10:17:38   (  -0.03,-137.20) (  -0.79,-133.70)  398.62                80
 04/23/2021   22:42:14   (   0.02,-137.20) (  -0.37,-139.01)  205.72                80
 04/24/2021   22:20:48   (   0.03,-137.20) (   0.62,-134.47)  310.76                80
 04/26/2021   10:45:16   (  -0.02,-137.20) (   0.52,-139.74)  289.44                80
 04/27/2021   10:23:50   (  -0.03,-137.19) (  -0.48,-135.20)  226.47                80
 04/28/2021   22:48:26   (   0.02,-137.17) (  -0.73,-140.50)  379.46                80
 04/29/2021   22:29:40   (   0.02,-137.16) (   0.26,-135.96)  136.02                80
 05/01/2021   10:51:27   (  -0.02,-137.14) (   0.88,-141.23)  465.65                80
 05/02/2021   10:30:02   (  -0.02,-137.13) (  -0.12,-136.70)   49.40                80
 05/04/2021   22:33:12   (   0.01,-137.08) (  -0.09,-137.45)   42.62                80
 05/05/2021   22:17:06   (   0.01,-137.07) (   0.91,-132.92)  472.40                80