Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/08/2021   10:12:10   (   0.42,-128.23) (   1.25,-131.88)  416.95                80
 09/09/2021   09:56:06   (   0.42,-128.22) (   0.25,-127.35)   98.46                80
 09/11/2021   21:56:38   (  -0.42,-128.13) (  -0.43,-128.12)    1.98                80
 09/14/2021   09:59:43   (   0.41,-128.14) (   0.55,-128.87)   82.91                80
 09/15/2021   09:43:39   (   0.41,-128.12) (  -0.45,-124.34)  431.36                80
 09/16/2021   22:02:55   (  -0.39,-128.04) (  -0.78,-129.63)  182.76                80
 09/17/2021   21:46:52   (  -0.39,-128.01) (   0.28,-125.11)  331.36                80
 09/19/2021   10:06:00   (   0.38,-128.03) (   0.90,-130.38)  267.48                80
 09/20/2021   09:49:55   (   0.38,-128.01) (  -0.10,-125.85)  246.87                80
 09/21/2021   22:09:12   (  -0.37,-127.93) (  -1.12,-131.14)  366.82                80