Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/20/2021   21:55:17   (  -0.01,-127.82) (  -0.02,-127.99)   18.75                80
 04/21/2021   21:39:12   (  -0.01,-127.79) (   0.97,-123.45)  494.30                80
 04/23/2021   10:00:58   (   0.02,-127.74) (   0.23,-128.71)  110.76                80
 04/24/2021   09:39:33   (   0.01,-127.70) (  -0.76,-124.17)  401.10                80
 04/25/2021   22:01:28   (  -0.02,-127.62) (  -0.45,-129.47)  210.89                80
 04/26/2021   21:45:23   (  -0.01,-127.58) (   0.60,-124.95)  301.39                80
 04/28/2021   10:07:10   (   0.02,-127.54) (   0.60,-130.20)  303.62                80
 04/29/2021   09:45:44   (   0.01,-127.49) (  -0.40,-125.67)  207.41                80
 04/30/2021   22:07:39   (  -0.02,-127.39) (  -0.80,-130.96)  407.17                80
 05/01/2021   21:51:34   (  -0.02,-127.34) (   0.19,-126.42)  104.32                80