Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/10/2021   10:52:49   (  -0.03,-137.20) (   0.35,-138.84)  187.67                80
 04/11/2021   10:31:12   (  -0.03,-137.19) (  -0.68,-134.25)  334.57                80
 04/12/2021   22:52:48   (   0.03,-137.19) (  -0.48,-139.47)  259.72                80
 04/13/2021   22:36:31   (   0.03,-137.18) (   0.55,-134.88)  262.23                80
 04/15/2021   10:57:59   (  -0.03,-137.16) (   0.62,-140.06)  330.72                80
 04/16/2021   10:36:21   (  -0.03,-137.14) (  -0.41,-135.47)  190.65                80
 04/17/2021   22:57:57   (   0.02,-137.13) (  -0.80,-140.67)  405.18                80
 04/18/2021   22:41:39   (   0.02,-137.11) (   0.23,-136.09)  115.88                80
 04/20/2021   11:03:08   (  -0.02,-137.07) (   0.94,-141.26)  478.36                80
 04/21/2021   10:41:30   (  -0.01,-137.05) (  -0.09,-136.68)   42.20                80