Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/08/2021   09:39:42   (  -0.03,-128.18) (  -0.88,-124.24)  447.78                80
 04/09/2021   22:01:39   (   0.02,-128.16) (  -0.28,-129.55)  157.66                80
 04/10/2021   21:45:33   (   0.02,-128.14) (   0.71,-125.01)  356.78                80
 04/12/2021   10:07:19   (  -0.01,-128.10) (   0.50,-130.27)  247.88                80
 04/13/2021   09:45:55   (  -0.02,-128.07) (  -0.55,-125.74)  265.50                80
 04/14/2021   22:07:50   (   0.01,-128.04) (  -0.67,-131.04)  342.01                80
 04/15/2021   21:51:46   (   0.02,-128.01) (   0.38,-126.51)  171.78                80
 04/17/2021   10:13:32   (  -0.00,-127.97) (   0.83,-131.77)  432.84                80
 04/18/2021   09:52:07   (  -0.01,-127.93) (  -0.16,-127.23)   79.75                80
 04/20/2021   21:55:17   (   0.00,-127.84) (  -0.06,-127.99)   17.44                80
 04/21/2021   21:39:12   (   0.01,-127.81) (   0.99,-123.46)  495.82                80