Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 31.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/31/2021   21:46:35   (   0.13,-127.83) (   0.70,-125.16)  302.65                80
 08/02/2021   10:05:45   (  -0.16,-127.97) (   0.38,-130.46)  282.87                80
 08/03/2021   09:49:40   (  -0.15,-128.00) (  -0.61,-125.92)  236.30                80
 08/04/2021   22:08:58   (   0.17,-127.93) (  -0.58,-131.23)  376.44                80
 08/05/2021   21:52:54   (   0.17,-127.95) (   0.46,-126.71)  142.28                80
 08/07/2021   10:12:04   (  -0.19,-128.08) (   0.67,-131.99)  444.52                80
 08/08/2021   09:55:59   (  -0.18,-128.10) (  -0.31,-127.45)   74.03                80
 08/10/2021   21:56:33   (   0.19,-128.04) (   0.17,-128.23)   21.17                80
 08/11/2021   21:40:28   (   0.18,-128.06) (   1.16,-123.70)  497.16                80
 08/13/2021   09:59:38   (  -0.20,-128.19) (  -0.02,-128.98)   90.51                80