Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/19/2021   22:10:10   (   0.10,-128.42) (   0.09,-128.39)    3.85                80
 03/22/2021   10:12:41   (  -0.08,-128.39) (   0.04,-128.98)   66.54                80
 03/23/2021   09:51:03   (  -0.09,-128.38) (  -0.97,-124.39)  455.02                80
 03/24/2021   22:12:40   (   0.07,-128.39) (  -0.22,-129.60)  138.59                80
 03/25/2021   21:56:23   (   0.08,-128.38) (   0.86,-125.02)  383.44                80
 03/27/2021   10:17:51   (  -0.06,-128.36) (   0.36,-130.19)  209.33                80
 03/28/2021   09:56:14   (  -0.07,-128.34) (  -0.71,-125.61)  311.70                80
 03/29/2021   22:17:49   (   0.06,-128.33) (  -0.53,-130.81)  283.73                80
 03/30/2021   22:01:33   (   0.07,-128.32) (   0.55,-126.24)  237.66                80