Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 3 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/21/2021   10:17:51   (  -0.05,-137.19) (  -0.80,-133.77)  389.66                80
 03/22/2021   22:39:48   (   0.04,-137.18) (  -0.36,-139.08)  216.22                80
 03/23/2021   22:23:42   (   0.04,-137.17) (   0.62,-134.54)  299.23                80
 03/25/2021   10:45:30   (  -0.03,-137.15) (   0.56,-139.81)  302.69                80
 03/26/2021   10:24:04   (  -0.03,-137.13) (  -0.43,-135.27)  212.34                80
 03/27/2021   22:46:00   (   0.02,-137.11) (  -0.73,-140.57)  394.74                80
 03/28/2021   22:29:55   (   0.03,-137.09) (   0.25,-136.03)  119.96                80
 03/30/2021   10:51:42   (  -0.03,-137.06) (   0.92,-141.30)  483.05                80
 03/31/2021   10:30:18   (  -0.03,-137.04) (  -0.12,-136.78)   31.22                80
 04/02/2021   22:33:28   (   0.03,-136.97) (  -0.11,-137.53)   63.95                80