Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/25/2021   22:01:28   (  -0.03,-127.64) (  -0.44,-129.47)  208.76                80
 04/26/2021   21:45:22   (  -0.02,-127.60) (   0.55,-124.93)  303.84                80
 04/28/2021   10:07:09   (   0.03,-127.55) (   0.65,-130.19)  301.42                80
 04/29/2021   09:45:44   (   0.02,-127.50) (  -0.40,-125.67)  209.92                80
 04/30/2021   22:07:40   (  -0.03,-127.42) (  -0.80,-130.96)  403.50                80
 05/01/2021   21:51:34   (  -0.03,-127.37) (   0.19,-126.42)  108.33                80
 05/03/2021   10:13:20   (   0.04,-127.33) (   1.01,-131.68)  496.47                80
 05/04/2021   09:51:55   (   0.03,-127.27) (   0.01,-127.14)   14.59                80
 05/06/2021   21:55:05   (  -0.03,-127.13) (  -0.22,-127.90)   88.52                80
 05/07/2021   21:38:59   (  -0.03,-127.08) (   0.78,-123.37)  423.25                80