Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/04/2021   09:49:49   (   0.43,-128.26) (  -0.10,-125.84)  275.52                80
 09/05/2021   22:09:06   (  -0.42,-128.19) (  -1.08,-131.15)  336.57                80
 09/06/2021   21:53:02   (  -0.42,-128.18) (  -0.08,-126.61)  178.67                80
 09/08/2021   10:12:10   (   0.42,-128.22) (   1.26,-131.88)  418.03                80
 09/09/2021   09:56:06   (   0.42,-128.21) (   0.26,-127.35)   97.16                80
 09/11/2021   21:56:38   (  -0.42,-128.12) (  -0.44,-128.12)    2.28                80
 09/14/2021   09:59:43   (   0.41,-128.12) (   0.55,-128.87)   85.46                80
 09/15/2021   09:43:39   (   0.41,-128.10) (  -0.44,-124.34)  428.57                80
 09/16/2021   22:02:55   (  -0.39,-128.01) (  -0.78,-129.63)  185.72                80