Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/01/2021   21:51:38   (  -0.04,-127.65) (   0.26,-126.45)  137.85                80
 05/03/2021   10:13:27   (   0.05,-127.76) (   0.95,-131.72)  450.99                80
 05/04/2021   09:52:03   (   0.04,-127.80) (  -0.08,-127.19)   68.94                80
 05/06/2021   21:55:18   (  -0.05,-127.85) (  -0.05,-127.98)   14.39                80
 05/09/2021   10:01:03   (   0.05,-128.01) (   0.23,-128.72)   82.30                80
 05/10/2021   09:39:39   (   0.04,-128.04) (  -0.80,-124.20)  437.31                80
 05/11/2021   22:01:38   (  -0.04,-128.04) (  -0.35,-129.52)  167.71                80
 05/12/2021   21:45:34   (  -0.03,-128.08) (   0.68,-124.99)  352.23                80
 05/14/2021   10:07:23   (   0.04,-128.19) (   0.53,-130.26)  236.64                80