Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/04/2021   09:52:04   (   0.05,-127.79) (  -0.09,-127.20)   68.49                80
 05/06/2021   21:55:17   (  -0.05,-127.85) (  -0.10,-127.97)   14.81                80
 05/09/2021   10:01:03   (   0.05,-127.99) (   0.22,-128.73)   83.59                80
 05/10/2021   09:39:40   (   0.04,-128.03) (  -0.82,-124.20)  435.81                80
 05/11/2021   22:01:37   (  -0.05,-128.03) (  -0.39,-129.51)  169.14                80
 05/12/2021   21:45:34   (  -0.04,-128.06) (   0.64,-124.98)  350.60                80
 05/14/2021   10:07:23   (   0.04,-128.17) (   0.51,-130.26)  238.85                80
 05/15/2021   09:45:59   (   0.04,-128.19) (  -0.52,-125.74)  279.81                80
 05/16/2021   22:07:57   (  -0.04,-128.17) (  -0.68,-131.04)  327.34                80
 05/17/2021   21:51:53   (  -0.04,-128.20) (   0.36,-126.52)  191.73                80