Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/11/2021   22:21:18   (  -0.00,-137.20) (   0.60,-134.55)  302.11                80
 06/13/2021   10:45:46   (   0.00,-137.20) (   0.60,-139.82)  298.62                80
 06/14/2021   10:24:23   (  -0.00,-137.20) (  -0.44,-135.29)  217.10                80
 06/15/2021   22:49:00   (  -0.00,-137.18) (  -0.74,-140.60)  388.71                80
 06/16/2021   22:27:36   (  -0.00,-137.18) (   0.25,-136.07)  126.78                80
 06/18/2021   10:52:04   (   0.01,-137.17) (   0.96,-141.33)  474.87                80
 06/19/2021   10:30:41   (   0.00,-137.16) (  -0.09,-136.81)   40.23                80
 06/21/2021   22:36:33   (   0.00,-137.12) (  -0.10,-137.58)   52.30                80
 06/22/2021   22:15:09   (   0.01,-137.11) (   0.89,-133.05)  462.00                80
 06/24/2021   10:36:58   (  -0.01,-137.08) (   0.26,-138.33)  141.72                80