Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/07/2021   10:01:08   (  -0.02,-128.20) (   0.12,-128.78)   66.00                80
 04/08/2021   09:39:43   (  -0.03,-128.18) (  -0.93,-124.25)  447.87                80
 04/09/2021   22:01:38   (   0.02,-128.16) (  -0.29,-129.55)  157.43                80
 04/10/2021   21:45:34   (   0.03,-128.15) (   0.76,-125.02)  357.12                80
 04/12/2021   10:07:20   (  -0.01,-128.10) (   0.46,-130.28)  247.34                80
 04/13/2021   09:45:55   (  -0.02,-128.08) (  -0.53,-125.74)  266.14                80
 04/14/2021   22:07:50   (   0.01,-128.04) (  -0.69,-131.03)  341.29                80
 04/15/2021   21:51:46   (   0.02,-128.02) (   0.36,-126.51)  172.61                80
 04/17/2021   10:13:32   (  -0.01,-127.98) (   0.85,-131.76)  431.79                80
 04/18/2021   09:52:07   (  -0.01,-127.94) (  -0.20,-127.24)   80.94                80