Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/14/2021   09:59:43   (   0.41,-128.10) (   0.55,-128.87)   87.01                80
 09/15/2021   09:43:39   (   0.41,-128.07) (  -0.45,-124.34)  426.55                80
 09/16/2021   22:02:55   (  -0.39,-127.98) (  -0.78,-129.63)  188.86                80
 09/17/2021   21:46:51   (  -0.39,-127.95) (   0.22,-125.10)  324.51                80
 09/19/2021   10:05:59   (   0.38,-127.96) (   0.95,-130.37)  275.29                80
 09/20/2021   09:49:55   (   0.38,-127.93) (  -0.11,-125.85)  238.37                80
 09/21/2021   22:09:12   (  -0.37,-127.84) (  -1.11,-131.14)  376.63                80
 09/22/2021   21:53:07   (  -0.38,-127.81) (  -0.11,-126.61)  136.75                80
 09/24/2021   10:12:15   (   0.36,-127.81) (   1.28,-131.88)  463.82                80
 09/25/2021   09:56:11   (   0.37,-127.78) (   0.27,-127.35)   49.39                80
 09/27/2021   21:56:43   (  -0.35,-127.65) (  -0.48,-128.11)   53.66                80