Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 5 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)
 05/04/2021   22:33:20   (   0.02,-137.20) (  -0.04,-137.49)   33.69                80
 05/05/2021   22:14:37   (   0.02,-137.20) (   0.99,-132.97)  482.38                80
 05/07/2021   10:39:05   (  -0.01,-137.19) (   0.22,-138.24)  119.10                80
 05/08/2021   10:17:42   (  -0.02,-137.19) (  -0.81,-133.71)  396.64                80
 05/09/2021   22:39:39   (   0.01,-137.19) (  -0.40,-139.01)  208.42                80
 05/10/2021   22:23:35   (   0.01,-137.18) (   0.63,-134.49)  307.09                80
 05/12/2021   10:45:24   (  -0.01,-137.17) (   0.58,-139.76)  295.38                80
 05/13/2021   10:24:00   (  -0.01,-137.16) (  -0.45,-135.23)  219.52                80
 05/14/2021   22:45:58   (   0.01,-137.14) (  -0.75,-140.54)  387.17                80
 05/15/2021   22:29:54   (   0.01,-137.13) (   0.28,-136.01)  127.42                80
 05/17/2021   10:51:42   (  -0.01,-137.10) (   0.93,-141.28)  476.40                80