Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 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)
 06/28/2021   22:02:15   (  -0.00,-128.23) (  -0.32,-129.63)  159.64                80
 06/29/2021   21:46:12   (  -0.01,-128.21) (   0.72,-125.11)  354.79                80
 07/01/2021   10:05:21   (  -0.00,-128.26) (   0.45,-130.38)  240.90                80
 07/02/2021   09:49:16   (   0.01,-128.24) (  -0.53,-125.85)  273.11                80
 07/03/2021   22:08:34   (   0.01,-128.12) (  -0.66,-131.15)  344.90                80
 07/04/2021   21:52:29   (   0.01,-128.10) (   0.31,-126.61)  169.05                80
 07/06/2021   10:11:40   (  -0.02,-128.15) (   0.79,-131.90)  427.08                80
 07/07/2021   09:55:35   (  -0.02,-128.12) (  -0.19,-127.37)   86.19                80
 07/09/2021   21:56:08   (   0.03,-127.96) (  -0.01,-128.14)   20.37                80
 07/10/2021   21:40:03   (   0.02,-127.93) (   0.97,-123.60)  492.67                80