Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/28/2021   09:59:25   (  -0.13,-127.83) (   0.12,-128.92)  124.97                80
 07/29/2021   09:43:22   (  -0.12,-127.86) (  -0.92,-124.40)  395.09                80
 07/30/2021   22:02:39   (   0.14,-127.80) (  -0.27,-129.70)  216.95                80
 07/31/2021   21:46:35   (   0.13,-127.83) (   0.71,-125.17)  302.81                80
 08/02/2021   10:05:45   (  -0.15,-127.98) (   0.37,-130.46)  281.66                80
 08/03/2021   09:49:41   (  -0.15,-128.01) (  -0.61,-125.92)  237.69                80
 08/04/2021   22:08:58   (   0.17,-127.94) (  -0.58,-131.23)  375.55                80
 08/05/2021   21:52:54   (   0.16,-127.96) (   0.47,-126.71)  143.36                80
 08/07/2021   10:12:04   (  -0.19,-128.10) (   0.68,-131.99)  442.40                80
 08/08/2021   09:55:59   (  -0.18,-128.13) (  -0.31,-127.45)   76.34                80