Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/15/2021   10:28:57   (   0.04,-137.20) (  -0.91,-133.05)  473.02                80
 07/16/2021   22:53:13   (  -0.04,-137.20) (  -0.26,-138.26)  120.08                80
 07/17/2021   22:31:35   (  -0.04,-137.21) (   0.74,-133.66)  403.26                80
 07/19/2021   10:55:42   (   0.03,-137.21) (   0.41,-138.84)  186.69                80
 07/20/2021   10:34:05   (   0.03,-137.20) (  -0.64,-134.26)  335.86                80
 07/21/2021   22:58:21   (  -0.02,-137.19) (  -0.51,-139.47)  259.16                80
 07/22/2021   22:36:44   (  -0.01,-137.19) (   0.54,-134.88)  262.98                80
 07/24/2021   11:00:51   (  -0.00,-137.17) (   0.62,-140.06)  328.53                80
 07/25/2021   10:39:12   (  -0.02,-137.16) (  -0.37,-135.46)  193.41                80
 07/26/2021   23:00:49   (   0.02,-137.15) (  -0.77,-140.68)  402.05                80
 07/27/2021   22:44:30   (   0.01,-137.14) (   0.23,-136.08)  120.42                80