Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 3 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/10/2021   10:24:09   (  -0.04,-137.21) (  -0.46,-135.29)  218.07                80
 03/11/2021   22:46:06   (   0.04,-137.22) (  -0.71,-140.60)  385.24                80
 03/12/2021   22:30:00   (   0.03,-137.22) (   0.27,-136.06)  131.25                80
 03/14/2021   10:51:47   (  -0.03,-137.20) (   0.92,-141.33)  470.22                80
 03/15/2021   10:30:23   (  -0.03,-137.20) (  -0.12,-136.80)   45.86                80
 03/17/2021   22:33:34   (   0.03,-137.19) (  -0.06,-137.57)   42.63                80
 03/18/2021   22:17:29   (   0.03,-137.19) (   0.98,-133.04)  472.97                80
 03/20/2021   10:39:17   (  -0.03,-137.16) (   0.21,-138.31)  129.95                80
 03/21/2021   10:17:51   (  -0.03,-137.15) (  -0.77,-133.77)  385.10                80
 03/22/2021   22:39:47   (   0.02,-137.13) (  -0.39,-139.07)  220.89                80
 03/23/2021   22:23:42   (   0.01,-137.11) (   0.59,-134.53)  293.86                80