Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/11/2021   10:52:45   (  -0.03,-137.22) (   0.40,-139.18)  223.00                80
 02/12/2021   10:31:08   (  -0.03,-137.22) (  -0.61,-134.59)  299.90                80
 02/13/2021   22:55:25   (   0.02,-137.23) (  -0.58,-139.80)  294.06                80
 02/14/2021   22:33:49   (   0.02,-137.23) (   0.49,-135.22)  228.68                80
 02/16/2021   10:57:56   (  -0.02,-137.22) (   0.70,-140.40)  362.36                80
 02/17/2021   10:36:20   (  -0.02,-137.22) (  -0.37,-135.82)  160.00                80
 02/18/2021   22:57:57   (   0.02,-137.21) (  -0.82,-141.04)  435.08                80
 02/19/2021   22:41:39   (   0.02,-137.21) (   0.20,-136.45)   86.93                80
 02/22/2021   10:41:29   (   0.00,-137.17) (  -0.01,-137.03)   16.43                80
 02/24/2021   22:44:09   (  -0.01,-137.14) (  -0.15,-137.66)   59.44                80