Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 12 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/25/2020   10:33:04   (  -0.02,-137.21) (  -0.10,-136.77)   50.49                80
 12/27/2020   22:33:37   (   0.01,-137.19) (  -0.05,-137.55)   40.92                80
 12/28/2020   22:17:32   (   0.00,-137.18) (   0.90,-133.01)  474.33                80
 12/30/2020   10:36:40   (   0.00,-137.16) (   0.25,-138.28)  128.03                80
 12/31/2020   10:20:36   (   0.01,-137.14) (  -0.76,-133.76)  386.52                80
 01/01/2021   22:39:52   (  -0.01,-137.11) (  -0.45,-139.06)  222.02                80
 01/02/2021   22:23:47   (  -0.01,-137.09) (   0.56,-134.53)  292.17                80
 01/04/2021   10:42:56   (   0.01,-137.06) (   0.59,-139.80)  311.38                80
 01/05/2021   10:26:50   (   0.01,-137.04) (  -0.36,-135.26)  202.44                80
 01/06/2021   22:46:08   (  -0.01,-137.00) (  -0.78,-140.58)  407.25                80
 01/07/2021   22:30:02   (  -0.01,-136.97) (   0.17,-136.03)  106.28                80