Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 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)
 04/21/2021   10:39:03   (  -0.02,-137.20) (   0.22,-138.24)  117.97                80
 04/22/2021   10:17:38   (  -0.02,-137.20) (  -0.83,-133.71)  398.72                80
 04/23/2021   22:42:14   (   0.02,-137.20) (  -0.38,-139.01)  206.03                80
 04/24/2021   22:20:48   (   0.02,-137.19) (   0.62,-134.47)  310.36                80
 04/26/2021   10:45:16   (  -0.02,-137.19) (   0.53,-139.74)  289.77                80
 04/27/2021   10:23:50   (  -0.02,-137.18) (  -0.47,-135.20)  226.07                80
 04/28/2021   22:48:25   (   0.02,-137.16) (  -0.74,-140.50)  380.23                80
 04/29/2021   22:29:40   (   0.02,-137.15) (   0.26,-135.96)  135.16                80
 05/01/2021   10:51:27   (  -0.01,-137.14) (   0.88,-141.23)  466.46                80
 05/02/2021   10:30:02   (  -0.01,-137.12) (  -0.11,-136.69)   48.53                80