Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/28/2021   10:07:09   (   0.04,-127.55) (   0.62,-130.20)  301.37                80
 04/29/2021   09:45:44   (   0.03,-127.50) (  -0.38,-125.66)  210.01                80
 04/30/2021   22:07:39   (  -0.04,-127.42) (  -0.83,-130.96)  402.73                80
 05/01/2021   21:51:34   (  -0.03,-127.38) (   0.17,-126.42)  109.21                80
 05/03/2021   10:13:20   (   0.04,-127.33) (   1.03,-131.68)  495.97                80
 05/04/2021   09:51:54   (   0.04,-127.28) (   0.03,-127.14)   15.39                80
 05/06/2021   21:55:04   (  -0.04,-127.14) (  -0.24,-127.90)   87.26                80
 05/07/2021   21:39:00   (  -0.04,-127.09) (   0.82,-123.37)  424.65                80
 05/09/2021   10:00:46   (   0.04,-127.05) (   0.38,-128.63)  180.22                80
 05/10/2021   09:39:21   (   0.03,-126.99) (  -0.62,-124.10)  330.60                80
 05/11/2021   22:01:16   (  -0.04,-126.89) (  -0.57,-129.39)  285.11                80