Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/26/2021   09:59:02   (   0.01,-128.36) (   0.11,-128.86)   56.27                80
 06/27/2021   09:42:58   (   0.02,-128.35) (  -0.86,-124.32)  457.96                80
 06/28/2021   22:02:15   (  -0.01,-128.23) (  -0.33,-129.63)  159.21                80
 06/29/2021   21:46:11   (  -0.02,-128.22) (   0.70,-125.10)  355.40                80
 07/01/2021   10:05:21   (   0.00,-128.28) (   0.47,-130.38)  239.46                80
 07/02/2021   09:49:16   (   0.01,-128.26) (  -0.51,-125.84)  274.73                80
 07/03/2021   22:08:33   (   0.01,-128.14) (  -0.69,-131.15)  343.52                80
 07/04/2021   21:52:30   (  -0.00,-128.12) (   0.35,-126.62)  170.59                80
 07/06/2021   10:11:39   (  -0.02,-128.17) (   0.82,-131.90)  424.75                80
 07/07/2021   09:55:36   (  -0.01,-128.15) (  -0.21,-127.37)   88.72                80