Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 10 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/15/2021   10:21:57   (   0.03,-137.20) (  -0.71,-133.90)  376.81                80
 10/16/2021   22:41:15   (  -0.03,-137.19) (  -0.49,-139.21)  229.83                80
 10/17/2021   22:25:12   (  -0.03,-137.19) (   0.56,-134.69)  285.89                80
 10/19/2021   10:44:23   (   0.02,-137.20) (   0.61,-139.97)  314.93                80
 10/20/2021   10:28:19   (   0.03,-137.19) (  -0.38,-135.43)  200.57                80
 10/21/2021   22:47:38   (  -0.02,-137.17) (  -0.82,-140.74)  406.67                80
 10/22/2021   22:31:34   (  -0.03,-137.16) (   0.18,-136.21)  108.39                80
 10/24/2021   10:50:44   (   0.02,-137.16) (   1.00,-141.49)  493.68                80
 10/25/2021   10:34:41   (   0.02,-137.15) (   0.00,-136.96)   20.94                80
 10/27/2021   22:35:17   (  -0.02,-137.09) (  -0.13,-137.75)   74.00                80
 10/28/2021   22:19:13   (  -0.01,-137.08) (   0.86,-133.22)  439.96                80