Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 3 31.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/31/2021   10:30:18   (  -0.04,-137.21) (  -0.11,-136.77)   49.29                80
 04/02/2021   22:33:28   (   0.04,-137.20) (  -0.06,-137.54)   39.53                80
 04/03/2021   22:17:24   (   0.04,-137.19) (   0.98,-133.01)  476.22                80
 04/05/2021   10:39:10   (  -0.03,-137.17) (   0.24,-138.27)  126.06                80
 04/06/2021   10:17:46   (  -0.03,-137.16) (  -0.81,-133.75)  389.36                80
 04/07/2021   22:39:41   (   0.02,-137.14) (  -0.41,-139.04)  216.07                80
 04/08/2021   22:23:36   (   0.02,-137.13) (   0.58,-134.50)  299.36                80
 04/10/2021   10:45:23   (  -0.02,-137.11) (   0.58,-139.77)  303.15                80
 04/11/2021   10:23:57   (  -0.02,-137.10) (  -0.41,-135.23)  211.91                80
 04/12/2021   22:45:54   (   0.02,-137.08) (  -0.74,-140.54)  394.46                80
 04/13/2021   22:29:48   (   0.02,-137.06) (   0.25,-136.00)  120.32                80