Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 8 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)
 08/18/2021   22:47:05   (  -0.04,-137.18) (  -0.85,-140.70)  401.57                80
 08/19/2021   22:31:02   (  -0.04,-137.17) (   0.20,-136.18)  113.80                80
 08/21/2021   10:52:50   (   0.03,-137.17) (   0.98,-141.45)  487.68                80
 08/22/2021   10:31:25   (   0.02,-137.16) (  -0.01,-136.91)   27.58                80
 08/24/2021   22:34:39   (  -0.02,-137.13) (  -0.13,-137.70)   64.34                80
 08/25/2021   22:18:35   (  -0.02,-137.12) (   0.86,-133.16)  450.92                80
 08/27/2021   10:37:43   (   0.02,-137.11) (   0.32,-138.43)  150.91                80
 08/28/2021   10:21:39   (   0.02,-137.09) (  -0.67,-133.90)  363.88                80
 08/29/2021   22:40:56   (  -0.01,-137.06) (  -0.51,-139.20)  244.41                80
 08/30/2021   22:24:52   (  -0.01,-137.04) (   0.54,-134.68)  269.86                80