Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 6 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/20/2021   06:39:40   (  -0.04, -75.19) (   0.11, -75.76)   64.86                80
 06/21/2021   06:23:22   (  -0.04, -75.18) (  -0.93, -71.17)  456.50                80
 06/22/2021   18:42:19   (   0.05, -75.16) (  -0.26, -76.38)  140.25                80
 06/23/2021   18:26:01   (   0.05, -75.14) (   0.79, -71.79)  381.33                80
 06/25/2021   06:44:48   (  -0.06, -75.12) (   0.35, -76.97)  211.13                80
 06/26/2021   06:28:30   (  -0.05, -75.10) (  -0.64, -72.37)  310.66                80
 06/27/2021   18:47:27   (   0.06, -75.09) (  -0.49, -77.60)  285.32                80
 06/28/2021   18:31:09   (   0.06, -75.08) (   0.50, -73.00)  237.25                80
 06/30/2021   06:49:56   (  -0.07, -75.08) (   0.64, -78.17)  353.27                80
 07/01/2021   06:33:39   (  -0.06, -75.07) (  -0.41, -73.59)  169.71                80