Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/28/2021   21:40:39   (  -0.36,-127.59) (   0.54,-123.58)  457.07                80
 09/30/2021   09:59:47   (   0.34,-127.55) (   0.63,-128.85)  148.35                80
 10/01/2021   09:43:43   (   0.34,-127.50) (  -0.38,-124.32)  363.59                80
 10/02/2021   22:02:59   (  -0.32,-127.41) (  -0.83,-129.61)  251.21                80
 10/03/2021   21:46:54   (  -0.33,-127.37) (   0.18,-125.08)  260.48                80
 10/05/2021   10:06:03   (   0.30,-127.32) (   0.99,-130.35)  345.92                80
 10/06/2021   09:49:58   (   0.31,-127.27) (  -0.02,-125.82)  165.72                80
 10/07/2021   22:09:15   (  -0.29,-127.18) (  -1.18,-131.12)  449.45                80
 10/08/2021   21:53:10   (  -0.30,-127.12) (  -0.17,-126.59)   61.63                80
 10/11/2021   09:53:34   (   0.29,-127.00) (   0.33,-127.32)   35.86                80