Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/01/2021   22:49:37   (  -0.04,-137.21) (  -0.07,-137.27)    7.10                80
 08/04/2021   10:52:07   (   0.03,-137.20) (   0.18,-137.86)   74.95                80
 08/05/2021   10:30:29   (   0.02,-137.19) (  -0.87,-133.27)  447.37                80
 08/06/2021   22:52:04   (  -0.01,-137.19) (  -0.31,-138.48)  147.55                80
 08/07/2021   22:35:47   (   0.02,-137.18) (   0.75,-133.89)  373.89                80
 08/09/2021   10:57:14   (  -0.01,-137.16) (   0.43,-139.07)  218.01                80
 08/10/2021   10:38:17   (  -0.01,-137.14) (  -0.63,-134.48)  303.93                80
 08/11/2021   22:57:12   (   0.01,-137.12) (  -0.55,-139.69)  291.61                80
 08/12/2021   22:40:54   (   0.00,-137.11) (   0.45,-135.09)  230.06                80
 08/14/2021   10:59:41   (  -0.00,-137.08) (   0.73,-140.26)  363.06                80