Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/30/2021   22:07:41   (  -0.04,-127.61) (  -0.79,-130.97)  383.03                80
 05/01/2021   21:51:38   (  -0.03,-127.65) (   0.24,-126.45)  137.65                80
 05/03/2021   10:13:27   (   0.04,-127.77) (   0.92,-131.72)  450.92                80
 05/04/2021   09:52:04   (   0.04,-127.80) (  -0.11,-127.20)   69.03                80
 05/06/2021   21:55:18   (  -0.04,-127.85) (  -0.07,-127.98)   14.29                80
 05/09/2021   10:01:03   (   0.04,-128.01) (   0.19,-128.73)   82.13                80
 05/10/2021   09:39:40   (   0.04,-128.04) (  -0.85,-124.21)  437.48                80
 05/11/2021   22:01:37   (  -0.04,-128.04) (  -0.36,-129.51)  167.71                80
 05/12/2021   21:45:34   (  -0.03,-128.08) (   0.68,-124.99)  352.23                80