Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/09/2021   22:01:38   (   0.01,-128.16) (  -0.29,-129.54)  157.68                80
 04/10/2021   21:45:33   (   0.02,-128.14) (   0.70,-125.01)  356.70                80
 04/12/2021   10:07:20   (  -0.01,-128.10) (   0.46,-130.28)  248.03                80
 04/13/2021   09:45:55   (  -0.02,-128.07) (  -0.53,-125.74)  265.30                80
 04/14/2021   22:07:50   (   0.01,-128.03) (  -0.69,-131.03)  342.32                80
 04/15/2021   21:51:46   (   0.01,-128.01) (   0.36,-126.51)  171.41                80
 04/17/2021   10:13:32   (  -0.00,-127.96) (   0.85,-131.76)  433.26                80
 04/18/2021   09:52:06   (  -0.01,-127.93) (  -0.15,-127.23)   79.31                80
 04/20/2021   21:55:17   (   0.00,-127.84) (  -0.02,-128.00)   17.86                80
 04/21/2021   21:39:12   (   0.01,-127.80) (   0.98,-123.46)  495.15                80