Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 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)
 09/27/2021   21:56:43   (  -0.35,-127.63) (  -0.48,-128.11)   55.25                80
 09/28/2021   21:40:38   (  -0.36,-127.59) (   0.52,-123.57)  456.90                80
 09/30/2021   09:59:47   (   0.34,-127.55) (   0.65,-128.85)  148.38                80
 10/01/2021   09:43:42   (   0.34,-127.50) (  -0.36,-124.31)  363.57                80
 10/02/2021   22:03:00   (  -0.32,-127.41) (  -0.79,-129.62)  251.41                80
 10/03/2021   21:46:54   (  -0.33,-127.37) (   0.16,-125.08)  260.28                80
 10/05/2021   10:06:02   (   0.30,-127.32) (   1.01,-130.35)  346.00                80
 10/06/2021   09:49:58   (   0.31,-127.27) (  -0.00,-125.82)  165.65                80
 10/07/2021   22:09:14   (  -0.29,-127.18) (  -1.20,-131.11)  449.69                80
 10/08/2021   21:53:10   (  -0.30,-127.12) (  -0.19,-126.58)   61.39                80