Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/07/2021   22:33:06   (  -0.03,-137.20) (   0.70,-133.88)  378.59                80
 08/09/2021   10:57:13   (   0.03,-137.20) (   0.47,-139.05)  211.35                80
 08/10/2021   10:35:36   (   0.03,-137.21) (  -0.58,-134.47)  311.90                80
 08/11/2021   22:57:11   (  -0.03,-137.21) (  -0.59,-139.67)  281.45                80
 08/12/2021   22:40:54   (  -0.03,-137.21) (   0.47,-135.09)  241.59                80
 08/14/2021   10:59:41   (   0.03,-137.20) (   0.71,-140.26)  349.49                80
 08/15/2021   10:43:22   (   0.03,-137.19) (  -0.29,-135.67)  172.93                80
 08/16/2021   23:02:18   (  -0.02,-137.18) (  -0.87,-140.87)  422.11                80
 08/17/2021   22:46:00   (   0.00,-137.16) (   0.19,-136.29)   99.31                80
 08/19/2021   11:04:48   (  -0.01,-137.14) (   0.99,-141.46)  493.56                80
 08/20/2021   10:48:30   (  -0.01,-137.12) (  -0.07,-136.88)   28.06                80