Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/09/2021   10:14:07   (   0.05,-128.52) (   0.12,-128.78)   30.47                80
 06/10/2021   09:52:30   (   0.05,-128.52) (  -0.93,-124.20)  492.28                80
 06/11/2021   22:14:06   (  -0.04,-128.43) (  -0.26,-129.41)  110.91                80
 06/12/2021   21:57:49   (  -0.05,-128.43) (   0.79,-124.82)  411.91                80
 06/14/2021   10:19:16   (   0.04,-128.50) (   0.36,-130.00)  170.48                80
 06/15/2021   09:57:37   (   0.05,-128.49) (  -0.63,-125.40)  351.80                80
 06/16/2021   22:19:14   (  -0.04,-128.39) (  -0.55,-130.61)  252.83                80
 06/17/2021   22:02:56   (  -0.05,-128.39) (   0.49,-126.02)  269.56                80
 06/19/2021   10:21:44   (   0.04,-128.45) (   0.65,-131.20)  313.00                80
 06/20/2021   10:02:45   (   0.05,-128.44) (  -0.34,-126.60)  208.73                80