Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/13/2021   23:01:33   (  -0.03,-137.20) (  -0.70,-140.25)  347.66                80
 10/14/2021   22:45:15   (  -0.03,-137.19) (   0.32,-135.65)  175.56                80
 10/16/2021   11:04:01   (   0.02,-137.20) (   0.84,-140.82)  412.95                80
 10/17/2021   10:47:43   (   0.02,-137.20) (  -0.18,-136.23)  110.29                80
 10/18/2021   23:06:39   (  -0.02,-137.19) (  -0.96,-141.44)  484.95                80
 10/19/2021   22:50:21   (  -0.02,-137.18) (   0.06,-136.85)   38.15                80
 10/22/2021   10:50:08   (   0.02,-137.18) (   0.08,-137.42)   28.14                80
 10/23/2021   10:33:50   (   0.02,-137.17) (  -0.94,-132.83)  494.31                80
 10/24/2021   22:52:45   (  -0.02,-137.14) (  -0.25,-138.03)  102.44                80
 10/25/2021   22:36:28   (  -0.02,-137.12) (   0.83,-133.45)  419.53                80