Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/05/2021   22:27:55   (  -0.06,-128.43) (  -1.02,-132.79)  495.94                80
 06/06/2021   22:11:38   (  -0.06,-128.44) (   0.02,-128.20)   27.98                80
 06/09/2021   10:14:08   (   0.05,-128.52) (   0.09,-128.79)   30.34                80
 06/10/2021   09:52:29   (   0.05,-128.52) (  -0.90,-124.19)  492.56                80
 06/11/2021   22:14:06   (  -0.04,-128.44) (  -0.28,-129.40)  110.66                80
 06/12/2021   21:57:48   (  -0.05,-128.43) (   0.76,-124.82)  412.23                80
 06/14/2021   10:19:15   (   0.04,-128.50) (   0.39,-129.99)  169.94                80
 06/15/2021   09:57:38   (   0.05,-128.50) (  -0.66,-125.41)  352.38                80
 06/16/2021   22:19:14   (  -0.04,-128.40) (  -0.52,-130.62)  252.29                80
 06/17/2021   22:02:56   (  -0.05,-128.39) (   0.47,-126.02)  270.17                80