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)
 06/19/2021   10:30:42   (   0.02,-137.19) (  -0.08,-136.82)   43.60                80
 06/21/2021   22:36:36   (  -0.01,-137.17) (  -0.09,-137.59)   47.83                80
 06/22/2021   22:15:13   (  -0.00,-137.16) (   0.94,-133.07)  466.98                80
 06/24/2021   10:39:41   (   0.00,-137.15) (   0.29,-138.33)  135.76                80
 06/25/2021   10:18:18   (  -0.01,-137.13) (  -0.75,-133.81)  378.55                80
 06/26/2021   22:40:15   (   0.01,-137.10) (  -0.45,-139.11)  229.56                80
 06/27/2021   22:24:11   (   0.01,-137.08) (   0.59,-134.59)  284.76                80
 06/29/2021   10:46:00   (  -0.01,-137.06) (   0.64,-139.85)  318.32                80
 06/30/2021   10:24:36   (  -0.01,-137.05) (  -0.39,-135.33)  195.95                80
 07/01/2021   22:46:34   (   0.00,-137.01) (  -0.80,-140.63)  412.39                80