Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/28/2021   22:40:38   (  -0.04,-137.20) (  -0.51,-139.16)  224.81                80
 07/29/2021   22:24:34   (  -0.04,-137.20) (   0.53,-134.64)  292.00                80
 07/31/2021   10:46:22   (   0.04,-137.21) (   0.67,-139.91)  307.46                80
 08/01/2021   10:24:59   (   0.03,-137.22) (  -0.38,-135.38)  208.78                80
 08/02/2021   22:46:56   (  -0.03,-137.21) (  -0.81,-140.69)  397.05                80
 08/03/2021   22:30:53   (  -0.02,-137.20) (   0.23,-136.17)  118.74                80
 08/05/2021   10:52:42   (  -0.01,-137.20) (   0.91,-141.45)  482.84                80
 08/06/2021   10:31:18   (  -0.02,-137.20) (  -0.08,-136.91)   32.46                80
 08/08/2021   22:34:30   (   0.01,-137.16) (  -0.12,-137.68)   59.53                80
 08/09/2021   22:18:27   (   0.01,-137.15) (   0.93,-133.16)  455.55                80