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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/05/2021   10:39:11   (  -0.04,-137.21) (   0.19,-138.28)  121.52                80
 04/06/2021   10:17:45   (  -0.04,-137.21) (  -0.80,-133.74)  395.10                80
 04/07/2021   22:39:42   (   0.03,-137.22) (  -0.36,-139.05)  208.23                80
 04/08/2021   22:23:36   (   0.03,-137.22) (   0.63,-134.51)  308.39                80
 04/10/2021   10:45:24   (  -0.03,-137.21) (   0.53,-139.78)  292.46                80
 04/11/2021   10:23:58   (  -0.03,-137.21) (  -0.46,-135.24)  223.80                80
 04/12/2021   22:45:54   (   0.03,-137.21) (  -0.70,-140.55)  380.44                80
 04/13/2021   22:29:49   (   0.03,-137.20) (   0.29,-136.01)  135.55                80
 04/15/2021   10:51:36   (  -0.03,-137.18) (   0.86,-141.28)  466.34                80
 04/16/2021   10:30:11   (  -0.03,-137.17) (  -0.13,-136.74)   49.05                80