Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/08/2021   22:23:36   (   0.03,-137.21) (   0.62,-134.51)  307.72                80
 04/10/2021   10:45:23   (  -0.03,-137.20) (   0.54,-139.78)  293.76                80
 04/11/2021   10:23:58   (  -0.03,-137.19) (  -0.45,-135.24)  222.28                80
 04/12/2021   22:45:54   (   0.03,-137.19) (  -0.71,-140.55)  382.08                80
 04/13/2021   22:29:49   (   0.03,-137.18) (   0.28,-136.01)  133.66                80
 04/15/2021   10:51:36   (  -0.03,-137.16) (   0.87,-141.28)  468.87                80
 04/16/2021   10:30:11   (  -0.03,-137.15) (  -0.12,-136.74)   46.27                80
 04/18/2021   22:33:21   (   0.02,-137.11) (  -0.05,-137.51)   44.91                80
 04/19/2021   22:17:16   (   0.02,-137.09) (   0.95,-132.97)  469.79                80
 04/21/2021   10:39:02   (  -0.01,-137.05) (   0.26,-138.23)  134.30                80