Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/04/2021   10:06:19   (   0.06,-128.50) (  -0.14,-127.58)  105.44                80
 06/05/2021   22:27:55   (  -0.06,-128.43) (  -1.04,-132.78)  495.94                80
 06/06/2021   22:11:38   (  -0.06,-128.44) (   0.00,-128.20)   27.89                80
 06/09/2021   10:14:08   (   0.05,-128.52) (   0.11,-128.79)   30.03                80
 06/10/2021   09:52:30   (   0.06,-128.52) (  -0.93,-124.20)  492.78                80
 06/11/2021   22:14:06   (  -0.05,-128.44) (  -0.25,-129.41)  110.45                80
 06/12/2021   21:57:48   (  -0.05,-128.44) (   0.73,-124.81)  412.47                80
 06/14/2021   10:19:16   (   0.04,-128.51) (   0.36,-130.00)  169.61                80
 06/15/2021   09:57:38   (   0.05,-128.50) (  -0.63,-125.40)  352.74                80
 06/16/2021   22:19:14   (  -0.05,-128.40) (  -0.55,-130.61)  251.95                80
 06/17/2021   22:02:57   (  -0.05,-128.40) (   0.49,-126.03)  270.52                80