Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 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)
 04/10/2021   10:45:23   (  -0.03,-137.20) (   0.55,-139.78)  294.11                80
 04/11/2021   10:23:59   (  -0.03,-137.19) (  -0.50,-135.25)  221.61                80
 04/12/2021   22:45:54   (   0.03,-137.18) (  -0.72,-140.54)  383.35                80
 04/13/2021   22:29:49   (   0.03,-137.17) (   0.27,-136.01)  132.06                80
 04/15/2021   10:51:36   (  -0.03,-137.14) (   0.88,-141.28)  470.91                80
 04/16/2021   10:30:10   (  -0.03,-137.12) (  -0.11,-136.74)   43.92                80
 04/18/2021   22:33:21   (   0.03,-137.08) (  -0.06,-137.51)   48.18                80
 04/19/2021   22:17:16   (   0.02,-137.06) (   0.93,-132.97)  466.12                80
 04/21/2021   10:39:02   (  -0.02,-137.02) (   0.28,-138.23)  138.40                80
 04/22/2021   10:17:38   (  -0.02,-136.99) (  -0.77,-133.70)  375.50                80
 04/23/2021   22:39:33   (   0.01,-136.95) (  -0.44,-139.00)  232.44                80