Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/22/2021   22:14:40   (  -0.01,-128.34) (  -0.99,-132.64)  490.18                80
 06/23/2021   21:58:36   (  -0.02,-128.33) (   0.04,-128.11)   24.54                80
 06/26/2021   10:01:42   (   0.01,-128.37) (   0.10,-128.86)   56.21                80
 06/27/2021   09:42:58   (   0.02,-128.35) (  -0.88,-124.33)  458.10                80
 06/28/2021   22:02:15   (  -0.01,-128.23) (  -0.32,-129.63)  159.11                80
 06/29/2021   21:46:11   (  -0.02,-128.22) (   0.66,-125.09)  355.51                80
 07/01/2021   10:05:21   (   0.00,-128.28) (   0.45,-130.38)  239.26                80
 07/02/2021   09:49:16   (   0.01,-128.26) (  -0.52,-125.85)  274.96                80
 07/03/2021   22:08:34   (   0.00,-128.14) (  -0.67,-131.15)  343.29                80
 07/04/2021   21:52:29   (  -0.00,-128.12) (   0.31,-126.62)  170.85                80
 07/06/2021   10:11:40   (  -0.02,-128.18) (   0.80,-131.90)  424.42                80