Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/04/2021   22:25:39   (  -0.00,-137.19) (   0.52,-134.74)  279.41                80
 12/06/2021   10:44:46   (   0.00,-137.19) (   0.65,-140.01)  321.64                80
 12/07/2021   10:28:40   (   0.01,-137.18) (  -0.38,-135.47)  194.24                80
 12/08/2021   22:47:54   (  -0.00,-137.16) (  -0.82,-140.77)  411.66                80
 12/09/2021   22:31:49   (  -0.00,-137.15) (   0.20,-136.24)  104.13                80
 12/11/2021   10:50:55   (   0.00,-137.14) (   0.95,-141.51)  497.23                80
 12/12/2021   10:34:49   (   0.00,-137.13) (  -0.02,-136.96)   18.55                80
 12/14/2021   22:35:18   (  -0.00,-137.10) (  -0.15,-137.73)   72.34                80
 12/15/2021   22:19:12   (  -0.01,-137.08) (   0.88,-133.20)  442.91                80
 12/17/2021   10:38:17   (   0.00,-137.06) (   0.34,-138.46)  159.63                80