Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/18/2021   10:52:06   (   0.02,-137.20) (   0.95,-141.34)  472.04                80
 06/19/2021   10:30:42   (   0.02,-137.19) (  -0.08,-136.81)   43.50                80
 06/21/2021   22:36:36   (  -0.01,-137.17) (  -0.09,-137.59)   47.97                80
 06/22/2021   22:15:13   (  -0.00,-137.16) (   0.94,-133.07)  466.78                80
 06/24/2021   10:39:41   (  -0.00,-137.14) (   0.29,-138.33)  136.06                80
 06/25/2021   10:18:18   (  -0.01,-137.13) (  -0.74,-133.81)  378.23                80
 06/26/2021   22:40:15   (   0.01,-137.10) (  -0.45,-139.11)  229.91                80
 06/27/2021   22:24:11   (   0.01,-137.08) (   0.58,-134.59)  284.36                80
 06/29/2021   10:46:01   (  -0.01,-137.06) (   0.59,-139.86)  318.83                80
 06/30/2021   10:24:36   (  -0.01,-137.04) (  -0.38,-135.33)  195.41                80
 07/01/2021   22:46:33   (   0.01,-137.01) (  -0.80,-140.63)  412.94                80