Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/10/2021   10:45:23   (  -0.03,-137.20) (   0.56,-139.77)  293.77                80
 04/11/2021   10:23:59   (  -0.03,-137.19) (  -0.49,-135.25)  222.24                80
 04/12/2021   22:45:54   (   0.03,-137.19) (  -0.73,-140.54)  382.22                80
 04/13/2021   22:29:49   (   0.03,-137.18) (   0.26,-136.00)  133.50                80
 04/15/2021   10:51:36   (  -0.03,-137.16) (   0.89,-141.27)  469.08                80
 04/16/2021   10:30:10   (  -0.03,-137.14) (  -0.10,-136.74)   46.06                80
 04/18/2021   22:33:21   (   0.02,-137.11) (  -0.06,-137.51)   45.24                80
 04/19/2021   22:17:16   (   0.02,-137.09) (   0.93,-132.97)  469.37                80
 04/21/2021   10:39:02   (  -0.01,-137.05) (   0.28,-138.23)  134.77                80
 04/22/2021   10:17:38   (  -0.01,-137.03) (  -0.77,-133.70)  379.44                80