Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/19/2021   23:05:30   (  -0.03,-137.19) (  -0.96,-141.42)  482.20                80
 06/20/2021   22:43:52   (  -0.02,-137.19) (   0.03,-136.83)   40.52                80
 06/23/2021   10:49:02   (   0.01,-137.17) (   0.06,-137.42)   28.01                80
 06/24/2021   10:27:24   (   0.00,-137.16) (  -0.98,-132.83)  493.69                80
 06/25/2021   22:51:40   (  -0.00,-137.14) (  -0.20,-138.04)  102.94                80
 06/26/2021   22:30:03   (   0.00,-137.12) (   0.84,-133.46)  418.66                80
 06/28/2021   10:54:09   (  -0.00,-137.11) (   0.35,-138.62)  172.75                80
 06/29/2021   10:32:32   (  -0.00,-137.09) (  -0.69,-134.03)  348.83                80
 06/30/2021   22:54:08   (  -0.00,-137.07) (  -0.49,-139.24)  248.01                80
 07/01/2021   22:37:51   (   0.00,-137.05) (   0.56,-134.66)  273.50                80
 07/03/2021   10:59:17   (  -0.00,-137.03) (   0.64,-139.82)  318.40                80