Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 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)
 07/21/2021   10:31:07   (   0.03,-137.20) (  -0.07,-136.88)   37.39                80
 07/23/2021   22:34:20   (  -0.02,-137.19) (  -0.14,-137.65)   53.39                80
 07/24/2021   22:18:16   (  -0.02,-137.18) (   0.90,-133.13)  462.08                80
 07/26/2021   10:40:05   (   0.03,-137.17) (   0.32,-138.39)  139.62                80
 07/27/2021   10:18:41   (   0.03,-137.16) (  -0.72,-133.87)  375.68                80
 07/28/2021   22:40:38   (  -0.03,-137.15) (  -0.47,-139.17)  230.71                80
 07/29/2021   22:24:34   (  -0.03,-137.14) (   0.51,-134.64)  284.51                80
 07/31/2021   10:46:23   (   0.02,-137.12) (   0.64,-139.91)  317.94                80
 08/01/2021   10:24:59   (   0.02,-137.11) (  -0.34,-135.38)  196.75                80
 08/02/2021   22:46:57   (   0.02,-137.08) (  -0.79,-140.70)  411.88                80
 08/03/2021   22:30:53   (   0.01,-137.07) (   0.19,-136.16)  102.53                80