Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/27/2021   10:23:51   (  -0.03,-137.20) (  -0.50,-135.21)  227.71                80
 04/28/2021   22:48:26   (   0.02,-137.20) (  -0.71,-140.50)  376.36                80
 04/29/2021   22:29:41   (   0.03,-137.20) (   0.29,-135.97)  139.93                80
 05/01/2021   10:51:27   (  -0.02,-137.19) (   0.91,-141.22)  460.98                80
 05/02/2021   10:30:02   (  -0.02,-137.18) (  -0.14,-136.70)   54.90                80
 05/04/2021   22:33:12   (   0.01,-137.16) (  -0.07,-137.46)   34.52                80
 05/05/2021   22:17:07   (   0.01,-137.15) (   0.93,-132.92)  481.35                80
 05/07/2021   10:38:54   (  -0.01,-137.14) (   0.21,-138.19)  120.07                80
 05/08/2021   10:17:29   (  -0.01,-137.12) (  -0.79,-133.65)  395.46                80
 05/09/2021   22:39:24   (   0.01,-137.11) (  -0.41,-138.95)  210.49                80
 05/10/2021   22:23:18   (   0.01,-137.09) (   0.59,-134.41)  304.80                80