Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 3 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/13/2021   22:08:05   (   0.11,-128.41) (  -0.49,-131.13)  309.93                80
 03/14/2021   21:52:01   (   0.12,-128.42) (   0.55,-126.60)  207.46                80
 03/16/2021   10:13:47   (  -0.11,-128.40) (   0.69,-131.86)  394.96                80
 03/17/2021   09:52:22   (  -0.11,-128.40) (  -0.34,-127.33)  121.46                80
 03/18/2021   22:14:19   (   0.10,-128.43) (  -0.82,-132.64)  479.24                80
 03/19/2021   21:58:13   (   0.10,-128.43) (   0.16,-128.10)   37.49                80
 03/22/2021   10:01:16   (  -0.09,-128.40) (  -0.02,-128.84)   49.44                80
 03/23/2021   09:39:51   (  -0.10,-128.39) (  -1.00,-124.30)  466.11                80
 03/24/2021   22:01:47   (   0.08,-128.40) (  -0.16,-129.61)  136.42                80
 03/25/2021   21:45:41   (   0.09,-128.40) (   0.83,-125.07)  379.48                80