Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/26/2021   21:45:23   (  -0.03,-127.60) (   0.57,-124.94)  304.01                80
 04/28/2021   10:07:09   (   0.03,-127.55) (   0.63,-130.19)  301.33                80
 04/29/2021   09:45:44   (   0.02,-127.51) (  -0.36,-125.66)  210.04                80
 04/30/2021   22:07:39   (  -0.03,-127.42) (  -0.85,-130.95)  403.18                80
 05/01/2021   21:51:34   (  -0.03,-127.38) (   0.21,-126.43)  108.74                80
 05/03/2021   10:13:21   (   0.04,-127.33) (   0.99,-131.69)  496.17                80
 05/04/2021   09:51:55   (   0.03,-127.28) (  -0.01,-127.15)   14.93                80
 05/06/2021   21:55:05   (  -0.04,-127.13) (  -0.20,-127.91)   87.94                80
 05/07/2021   21:39:00   (  -0.03,-127.09) (   0.80,-123.37)  423.88                80
 05/09/2021   10:00:46   (   0.04,-127.04) (   0.40,-128.63)  180.70                80