Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 12 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2020   22:46:06   (   0.02,-137.22) (  -0.72,-140.56)  380.61                80
 12/22/2020   22:30:01   (   0.02,-137.22) (   0.29,-136.03)  135.40                80
 12/24/2020   10:49:10   (  -0.02,-137.22) (   0.87,-141.31)  465.37                80
 12/25/2020   10:33:04   (  -0.01,-137.21) (  -0.08,-136.76)   50.39                80
 12/27/2020   22:33:37   (   0.00,-137.18) (  -0.07,-137.55)   41.49                80
 12/28/2020   22:17:32   (  -0.01,-137.17) (   0.94,-133.02)  473.53                80
 12/30/2020   10:36:40   (   0.01,-137.15) (   0.27,-138.28)  128.98                80
 12/31/2020   10:20:35   (   0.01,-137.13) (  -0.74,-133.75)  385.38                80
 01/01/2021   22:39:52   (  -0.01,-137.10) (  -0.47,-139.05)  223.49                80
 01/02/2021   22:23:47   (  -0.01,-137.08) (   0.55,-134.52)  290.51                80