Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/04/2021   21:52:30   (   0.01,-128.09) (   0.33,-126.62)  168.11                80
 07/06/2021   10:11:39   (  -0.03,-128.13) (   0.83,-131.89)  429.28                80
 07/07/2021   09:55:35   (  -0.03,-128.10) (  -0.21,-127.37)   83.71                80
 07/09/2021   21:56:08   (   0.04,-127.94) (  -0.01,-128.14)   22.80                80
 07/10/2021   21:40:04   (   0.03,-127.91) (   0.97,-123.60)  489.92                80
 07/12/2021   09:59:13   (  -0.05,-127.93) (   0.19,-128.88)  108.58                80
 07/13/2021   09:43:10   (  -0.03,-127.89) (  -0.85,-124.36)  403.80                80
 07/14/2021   22:02:26   (   0.05,-127.75) (  -0.40,-129.65)  216.66                80
 07/15/2021   21:46:22   (   0.04,-127.72) (   0.64,-125.13)  295.67                80
 07/17/2021   10:05:32   (  -0.06,-127.74) (   0.52,-130.40)  303.26                80