Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/17/2021   22:49:26   (  -0.04,-137.21) (  -0.78,-140.67)  393.57                80
 07/18/2021   22:28:01   (  -0.03,-137.21) (   0.20,-136.13)  122.59                80
 07/20/2021   10:52:31   (   0.03,-137.21) (   0.96,-141.41)  478.59                80
 07/21/2021   10:31:06   (   0.02,-137.20) (  -0.02,-136.87)   36.96                80
 07/23/2021   22:37:00   (   0.00,-137.18) (  -0.13,-137.66)   54.36                80
 07/24/2021   22:18:17   (   0.01,-137.18) (   0.92,-133.13)  460.75                80
 07/26/2021   10:40:06   (  -0.02,-137.16) (   0.23,-138.41)  141.48                80
 07/27/2021   10:21:22   (  -0.01,-137.16) (  -0.75,-133.87)  374.13                80
 07/28/2021   22:40:39   (  -0.01,-137.14) (  -0.44,-139.18)  231.89                80
 07/29/2021   22:24:34   (  -0.01,-137.13) (   0.54,-134.64)  283.36                80