Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/13/2021   22:18:46   (   0.22,-128.11) (  -0.24,-130.11)  227.53                80
 08/14/2021   22:02:29   (   0.21,-128.13) (   0.82,-125.52)  297.46                80
 08/16/2021   10:21:17   (  -0.23,-128.24) (   0.30,-130.71)  280.76                80
 08/17/2021   10:04:59   (  -0.23,-128.25) (  -0.69,-126.11)  243.84                80
 08/18/2021   22:23:54   (   0.25,-128.17) (  -0.47,-131.32)  358.57                80
 08/19/2021   22:07:36   (   0.24,-128.18) (   0.59,-126.73)  165.53                80
 08/21/2021   10:26:25   (  -0.26,-128.28) (   0.53,-131.92)  413.98                80
 08/22/2021   10:10:06   (  -0.26,-128.29) (  -0.46,-127.32)  110.39                80
 08/23/2021   22:31:41   (   0.27,-128.22) (  -0.69,-132.53)  491.43                80
 08/24/2021   22:10:03   (   0.26,-128.22) (   0.31,-127.93)   32.76                80