Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/23/2021   10:00:58   (   0.03,-127.74) (   0.24,-128.71)  110.13                80
 04/24/2021   09:39:32   (   0.02,-127.70) (  -0.76,-124.17)  401.92                80
 04/25/2021   22:01:28   (  -0.03,-127.64) (  -0.46,-129.47)  209.32                80
 04/26/2021   21:45:23   (  -0.02,-127.60) (   0.60,-124.94)  303.17                80
 04/28/2021   10:07:10   (   0.03,-127.55) (   0.60,-130.20)  301.91                80
 04/29/2021   09:45:44   (   0.02,-127.50) (  -0.39,-125.66)  209.30                80
 04/30/2021   22:07:39   (  -0.03,-127.41) (  -0.82,-130.96)  404.61                80
 05/01/2021   21:51:34   (  -0.02,-127.36) (   0.18,-126.42)  107.09                80
 05/03/2021   10:13:20   (   0.03,-127.32) (   1.02,-131.68)  497.60                80
 05/04/2021   09:51:55   (   0.03,-127.26) (   0.03,-127.14)   13.64                80
 05/06/2021   21:55:05   (  -0.03,-127.11) (  -0.23,-127.90)   90.40                80