Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 6 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/21/2021   06:23:22   (  -0.03, -75.18) (  -0.91, -71.17)  457.14                80
 06/22/2021   18:42:19   (   0.05, -75.16) (  -0.22, -76.39)  139.34                80
 06/23/2021   18:26:01   (   0.04, -75.15) (   0.77, -71.79)  382.46                80
 06/25/2021   06:44:48   (  -0.05, -75.13) (   0.37, -76.97)  209.58                80
 06/26/2021   06:28:31   (  -0.05, -75.12) (  -0.68, -72.38)  312.40                80
 06/27/2021   18:47:27   (   0.06, -75.11) (  -0.51, -77.59)  283.35                80
 06/28/2021   18:31:09   (   0.05, -75.10) (   0.54, -73.01)  239.44                80
 06/30/2021   06:49:57   (  -0.06, -75.10) (   0.60, -78.18)  350.61                80
 07/01/2021   06:33:38   (  -0.06, -75.10) (  -0.39, -73.58)  172.58                80
 07/02/2021   18:52:35   (   0.07, -75.10) (  -0.79, -78.79)  421.82                80
 07/03/2021   18:36:17   (   0.07, -75.10) (   0.26, -74.21)  101.88                80