Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 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)
 04/21/2021   10:39:03   (  -0.03,-137.20) (   0.22,-138.24)  118.04                80
 04/22/2021   10:17:38   (  -0.03,-137.20) (  -0.83,-133.71)  398.73                80
 04/23/2021   22:42:14   (   0.02,-137.20) (  -0.38,-139.01)  205.73                80
 04/24/2021   22:20:48   (   0.02,-137.20) (   0.61,-134.47)  310.75                80
 04/26/2021   10:45:16   (  -0.02,-137.20) (   0.53,-139.74)  289.31                80
 04/27/2021   10:23:50   (  -0.02,-137.19) (  -0.47,-135.20)  226.60                80
 04/28/2021   22:48:25   (   0.02,-137.17) (  -0.74,-140.50)  379.43                80
 04/29/2021   22:27:01   (   0.02,-137.16) (   0.31,-135.97)  136.04                80
 05/01/2021   10:51:27   (  -0.02,-137.14) (   0.89,-141.23)  465.51                80
 05/02/2021   10:30:02   (  -0.02,-137.13) (  -0.11,-136.69)   49.55                80
 05/04/2021   22:33:12   (   0.01,-137.08) (  -0.09,-137.45)   42.57                80