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) (  -0.97,-132.64)  490.17                80
 06/23/2021   21:58:36   (  -0.02,-128.33) (   0.00,-128.10)   24.75                80
 06/26/2021   09:59:02   (   0.01,-128.37) (   0.13,-128.86)   56.05                80
 06/27/2021   09:42:58   (   0.02,-128.35) (  -0.90,-124.33)  458.21                80
 06/28/2021   22:02:15   (  -0.01,-128.23) (  -0.30,-129.64)  159.12                80
 06/29/2021   21:46:11   (  -0.02,-128.22) (   0.68,-125.10)  355.51                80
 07/01/2021   10:05:20   (   0.01,-128.28) (   0.49,-130.37)  239.16                80
 07/02/2021   09:49:17   (   0.02,-128.26) (  -0.54,-125.85)  275.06                80
 07/03/2021   22:08:34   (   0.00,-128.14) (  -0.65,-131.16)  343.27                80
 07/04/2021   21:52:30   (  -0.01,-128.12) (   0.33,-126.62)  170.86                80