Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 5 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/20/2021   22:36:13   (   0.01,-137.20) (  -0.05,-137.53)   38.04                80
 05/21/2021   22:14:49   (   0.01,-137.20) (   0.93,-133.00)  477.89                80
 05/23/2021   10:39:18   (  -0.00,-137.19) (   0.22,-138.28)  123.17                80
 05/24/2021   10:17:53   (  -0.01,-137.19) (  -0.76,-133.74)  392.15                80
 05/25/2021   22:42:31   (   0.01,-137.17) (  -0.44,-139.05)  214.59                80
 05/26/2021   22:21:07   (   0.01,-137.16) (   0.60,-134.52)  300.24                80
 05/28/2021   10:45:36   (  -0.01,-137.14) (   0.60,-139.79)  302.45                80
 05/29/2021   10:24:12   (  -0.01,-137.12) (  -0.44,-135.27)  211.94                80
 05/30/2021   22:46:09   (   0.01,-137.09) (  -0.75,-140.57)  396.06                80
 05/31/2021   22:30:05   (   0.01,-137.08) (   0.23,-136.04)  118.33                80
 06/02/2021   10:51:53   (  -0.00,-137.05) (   0.98,-141.30)  484.76                80
 06/03/2021   10:30:30   (  -0.00,-137.04) (  -0.06,-136.78)   29.48                80