Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/03/2021   22:41:45   (   0.00,-137.20) (  -0.48,-139.27)  236.93                80
 12/04/2021   22:25:40   (  -0.00,-137.19) (   0.54,-134.74)  279.40                80
 12/06/2021   10:44:46   (   0.00,-137.19) (   0.62,-140.01)  321.67                80
 12/07/2021   10:28:40   (   0.01,-137.18) (  -0.35,-135.47)  194.21                80
 12/08/2021   22:47:55   (  -0.00,-137.16) (  -0.80,-140.78)  411.75                80
 12/09/2021   22:31:49   (  -0.00,-137.15) (   0.23,-136.24)  104.08                80
 12/11/2021   10:50:55   (   0.00,-137.14) (   0.99,-141.50)  497.36                80
 12/12/2021   10:34:49   (   0.00,-137.13) (  -0.04,-136.97)   18.31                80
 12/14/2021   22:35:18   (  -0.00,-137.10) (  -0.14,-137.73)   72.57                80
 12/15/2021   22:19:12   (  -0.01,-137.08) (   0.84,-133.19)  442.67                80