Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/08/2021   10:12:10   (   0.42,-128.23) (   1.26,-131.88)  417.09                80
 09/09/2021   09:56:07   (   0.42,-128.22) (   0.20,-127.36)   98.29                80
 09/11/2021   21:56:38   (  -0.42,-128.13) (  -0.44,-128.12)    2.50                80
 09/14/2021   09:59:43   (   0.41,-128.14) (   0.56,-128.87)   83.35                80
 09/15/2021   09:43:39   (   0.41,-128.12) (  -0.44,-124.34)  430.85                80
 09/16/2021   22:02:56   (  -0.39,-128.03) (  -0.73,-129.65)  183.25                80
 09/17/2021   21:46:52   (  -0.39,-128.01) (   0.27,-125.11)  330.80                80
 09/19/2021   10:06:00   (   0.38,-128.03) (   0.90,-130.38)  268.21                80
 09/20/2021   09:49:55   (   0.38,-128.01) (  -0.10,-125.85)  246.08                80