Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 10 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/16/2021   18:41:01   (   0.05, -75.20) (   0.08, -75.21)    2.88                80
 10/19/2021   06:46:09   (  -0.05, -75.22) (   0.06, -75.79)   63.94                80
 10/20/2021   06:24:31   (  -0.06, -75.23) (  -0.97, -71.19)  460.65                80
 10/21/2021   18:48:46   (   0.04, -75.25) (  -0.22, -76.40)  130.70                80
 10/22/2021   18:27:08   (   0.05, -75.27) (   0.80, -71.80)  394.25                80
 10/24/2021   06:51:14   (  -0.03, -75.29) (   0.35, -76.97)  191.69                80
 10/25/2021   06:29:35   (  -0.04, -75.31) (  -0.67, -72.38)  333.24                80
 10/26/2021   18:53:52   (   0.03, -75.33) (  -0.45, -77.59)  257.74                80
 10/27/2021   18:32:13   (   0.04, -75.34) (   0.57, -73.00)  267.51                80