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   22:27:15   (   0.02,-137.19) (   0.31,-136.02)  134.84                80
 05/17/2021   10:51:43   (  -0.01,-137.19) (   0.90,-141.28)  465.93                80
 05/18/2021   10:30:20   (  -0.01,-137.19) (  -0.13,-136.76)   49.71                80
 05/20/2021   22:36:12   (   0.01,-137.17) (  -0.09,-137.53)   41.25                80
 05/21/2021   22:14:49   (   0.01,-137.16) (   0.94,-133.00)  474.03                80
 05/23/2021   10:39:17   (  -0.01,-137.15) (   0.27,-138.27)  128.03                80
 05/24/2021   10:17:54   (  -0.01,-137.14) (  -0.77,-133.74)  386.69                80
 05/25/2021   22:42:31   (   0.01,-137.11) (  -0.42,-139.05)  221.08                80
 05/26/2021   22:23:47   (   0.01,-137.09) (   0.56,-134.51)  293.12                80
 05/28/2021   10:45:36   (  -0.01,-137.06) (   0.59,-139.79)  310.62                80