Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/22/2021   22:15:12   (  -0.01,-137.20) (   0.89,-133.06)  471.03                80
 06/24/2021   10:39:41   (   0.01,-137.21) (   0.28,-138.33)  128.83                80
 06/25/2021   10:18:18   (   0.00,-137.21) (  -0.75,-133.81)  387.10                80
 06/26/2021   22:42:55   (  -0.00,-137.20) (  -0.44,-139.11)  218.80                80
 06/27/2021   22:21:32   (   0.00,-137.20) (   0.59,-134.59)  297.19                80
 06/29/2021   10:46:01   (   0.00,-137.20) (   0.58,-139.87)  302.87                80
 06/30/2021   10:24:36   (   0.00,-137.20) (  -0.40,-135.33)  213.04                80
 07/01/2021   22:49:14   (  -0.01,-137.19) (  -0.80,-140.63)  393.17                80
 07/02/2021   22:30:30   (  -0.00,-137.18) (   0.24,-136.11)  122.51                80
 07/04/2021   10:52:19   (   0.00,-137.19) (   0.93,-141.38)  478.31                80
 07/05/2021   10:30:56   (  -0.01,-137.18) (  -0.10,-136.86)   36.94                80