Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 5 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/15/2021   22:27:14   (   0.02,-137.19) (   0.28,-136.01)  134.79                80
 05/17/2021   10:51:43   (  -0.01,-137.19) (   0.93,-141.28)  465.97                80
 05/18/2021   10:30:19   (  -0.01,-137.19) (  -0.11,-136.75)   49.59                80
 05/20/2021   22:36:13   (   0.01,-137.17) (  -0.06,-137.53)   41.31                80
 05/21/2021   22:14:48   (   0.01,-137.16) (   0.92,-133.00)  473.92                80
 05/23/2021   10:39:18   (  -0.01,-137.15) (   0.23,-138.28)  128.14                80
 05/24/2021   10:17:53   (  -0.01,-137.13) (  -0.75,-133.74)  386.56                80
 05/25/2021   22:42:31   (   0.01,-137.11) (  -0.44,-139.04)  221.26                80
 05/26/2021   22:23:47   (   0.01,-137.09) (   0.60,-134.52)  292.93                80
 05/28/2021   10:45:35   (  -0.01,-137.06) (   0.61,-139.79)  310.79                80
 05/29/2021   10:24:12   (  -0.01,-137.04) (  -0.43,-135.26)  203.01                80