Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/11/2021   21:56:38   (  -0.42,-128.11) (  -0.44,-128.12)    2.95                80
 09/14/2021   09:59:43   (   0.41,-128.10) (   0.56,-128.87)   87.18                80
 09/15/2021   09:43:39   (   0.41,-128.07) (  -0.44,-124.34)  426.33                80
 09/16/2021   22:02:55   (  -0.39,-127.98) (  -0.79,-129.63)  189.04                80
 09/17/2021   21:46:50   (  -0.39,-127.95) (   0.22,-125.10)  324.30                80
 09/19/2021   10:06:00   (   0.38,-127.96) (   0.90,-130.38)  275.65                80
 09/20/2021   09:49:55   (   0.38,-127.93) (  -0.11,-125.85)  237.97                80
 09/21/2021   22:09:12   (  -0.37,-127.84) (  -1.12,-131.14)  376.95                80
 09/22/2021   21:53:07   (  -0.38,-127.81) (  -0.11,-126.61)  136.39                80
 09/24/2021   10:12:15   (   0.36,-127.81) (   1.29,-131.88)  464.36                80