Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/19/2021   10:12:30   (   0.07,-128.27) (   0.12,-128.53)   29.70                80
 05/20/2021   09:50:53   (   0.07,-128.29) (  -0.92,-123.94)  495.37                80
 05/21/2021   22:12:29   (  -0.07,-128.25) (  -0.25,-129.16)  102.57                80
 05/22/2021   21:56:12   (  -0.07,-128.27) (   0.79,-124.57)  422.79                80
 05/24/2021   10:17:39   (   0.07,-128.37) (   0.40,-129.74)  156.47                80
 05/25/2021   09:56:02   (   0.07,-128.38) (  -0.64,-125.15)  367.86                80
 05/26/2021   22:17:38   (  -0.07,-128.33) (  -0.53,-130.36)  232.32                80
 05/27/2021   22:01:20   (  -0.07,-128.34) (   0.50,-125.78)  292.07                80
 05/29/2021   10:22:49   (   0.07,-128.43) (   0.62,-130.96)  287.66                80
 05/30/2021   10:01:11   (   0.07,-128.44) (  -0.42,-126.38)  236.13                80
 05/31/2021   22:22:46   (  -0.07,-128.37) (  -0.81,-131.57)  365.42                80
 06/01/2021   22:06:29   (  -0.07,-128.38) (   0.23,-126.99)  158.83                80