Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 1 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/01/2021   22:39:53   (   0.01,-137.22) (  -0.39,-139.07)  210.72                80
 01/02/2021   22:23:48   (   0.01,-137.21) (   0.62,-134.54)  304.99                80
 01/04/2021   10:45:36   (  -0.02,-137.20) (   0.59,-139.80)  296.90                80
 01/05/2021   10:24:11   (  -0.02,-137.20) (  -0.42,-135.27)  218.52                80
 01/06/2021   22:46:09   (   0.02,-137.18) (  -0.73,-140.59)  388.08                80
 01/07/2021   22:30:04   (   0.01,-137.17) (   0.29,-136.06)  127.14                80
 01/09/2021   10:49:11   (  -0.00,-137.15) (   0.92,-141.32)  475.35                80
 01/10/2021   10:33:07   (   0.01,-137.13) (  -0.09,-136.79)   39.41                80
 01/12/2021   22:33:39   (  -0.01,-137.08) (  -0.10,-137.56)   54.75                80
 01/13/2021   22:17:34   (  -0.01,-137.06) (   0.92,-133.03)  459.37                80