Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 8 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)
 08/21/2021   10:52:50   (   0.04,-137.19) (   1.00,-141.44)  484.42                80
 08/22/2021   10:31:25   (   0.04,-137.20) (   0.00,-136.91)   32.46                80
 08/24/2021   22:34:39   (  -0.04,-137.20) (  -0.14,-137.69)   55.91                80
 08/25/2021   22:18:34   (  -0.04,-137.21) (   0.85,-133.16)  460.81                80
 08/27/2021   10:40:23   (   0.03,-137.22) (   0.33,-138.43)  138.44                80
 08/28/2021   10:18:59   (   0.03,-137.22) (  -0.72,-133.91)  377.86                80
 08/29/2021   22:40:57   (  -0.03,-137.21) (  -0.46,-139.21)  228.36                80
 08/30/2021   22:24:52   (  -0.03,-137.20) (   0.53,-134.68)  287.44                80
 09/01/2021   10:44:00   (   0.02,-137.20) (   0.65,-139.95)  313.35                80
 09/02/2021   10:27:57   (   0.01,-137.19) (  -0.40,-135.43)  201.79                80
 09/03/2021   22:47:14   (   0.00,-137.17) (  -0.78,-140.73)  406.14                80