Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 3 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)
 03/15/2021   10:30:24   (  -0.05,-137.20) (  -0.16,-136.81)   45.56                80
 03/17/2021   22:33:34   (   0.04,-137.19) (  -0.02,-137.57)   43.68                80
 03/18/2021   22:17:29   (   0.04,-137.18) (   0.95,-133.03)  471.82                80
 03/20/2021   10:39:16   (  -0.04,-137.15) (   0.23,-138.30)  130.96                80
 03/21/2021   10:17:52   (  -0.04,-137.14) (  -0.81,-133.77)  383.97                80
 03/22/2021   22:39:47   (   0.03,-137.12) (  -0.41,-139.07)  222.55                80
 03/23/2021   22:23:42   (   0.03,-137.10) (   0.57,-134.53)  292.06                80
 03/25/2021   10:45:29   (  -0.02,-137.06) (   0.61,-139.79)  311.84                80
 03/26/2021   10:24:04   (  -0.02,-137.04) (  -0.43,-135.27)  202.34                80
 03/27/2021   22:46:00   (   0.01,-137.01) (  -0.78,-140.56)  405.42                80
 03/28/2021   22:29:54   (   0.01,-136.98) (   0.20,-136.02)  108.46                80