Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 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)
 06/27/2021   22:21:31   (  -0.02,-137.19) (   0.54,-134.58)  296.92                80
 06/29/2021   10:46:00   (   0.02,-137.19) (   0.62,-139.85)  304.09                80
 06/30/2021   10:24:37   (   0.02,-137.18) (  -0.41,-135.33)  211.45                80
 07/01/2021   22:49:14   (  -0.02,-137.17) (  -0.78,-140.64)  394.70                80
 07/02/2021   22:30:29   (  -0.02,-137.16) (   0.19,-136.10)  120.70                80
 07/04/2021   10:52:19   (   0.02,-137.16) (   0.97,-141.37)  481.03                80
 07/05/2021   10:30:55   (   0.01,-137.14) (  -0.07,-136.85)   33.75                80
 07/07/2021   22:34:08   (   0.00,-137.10) (  -0.14,-137.62)   59.77                80
 07/08/2021   22:18:05   (   0.01,-137.09) (   0.89,-133.10)  454.50                80
 07/10/2021   10:39:54   (  -0.01,-137.06) (   0.27,-138.37)  148.97                80