Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/08/2021   22:04:30   (   0.04,-127.97) (   0.45,-126.25)  196.81                80
 07/10/2021   10:23:18   (  -0.06,-128.00) (   0.68,-131.43)  390.24                80
 07/11/2021   10:06:59   (  -0.05,-127.97) (  -0.31,-126.83)  129.23                80
 07/12/2021   22:25:55   (   0.07,-127.83) (  -0.86,-132.04)  480.06                80
 07/13/2021   22:09:37   (   0.06,-127.79) (   0.13,-127.44)   39.37                80
 07/16/2021   10:09:26   (  -0.07,-127.78) (   0.02,-128.02)   29.22                80
 07/17/2021   09:53:08   (  -0.06,-127.73) (  -1.03,-123.44)  489.85                80
 07/18/2021   22:12:04   (   0.08,-127.59) (  -0.18,-128.64)  120.64                80
 07/19/2021   21:55:46   (   0.07,-127.54) (   0.87,-124.06)  397.86                80
 07/21/2021   10:14:33   (  -0.09,-127.55) (   0.28,-129.23)  191.39                80