Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/08/2021   22:13:38   (   0.20,-128.02) (  -0.01,-128.90)  100.99                80
 08/09/2021   21:57:21   (   0.19,-128.03) (   1.05,-124.31)  424.39                80
 08/11/2021   10:16:09   (  -0.21,-128.15) (   0.07,-129.50)  152.86                80
 08/12/2021   09:59:51   (  -0.20,-128.17) (  -0.93,-124.90)  372.48                80
 08/13/2021   22:18:46   (   0.22,-128.10) (  -0.24,-130.11)  229.06                80
 08/14/2021   22:02:29   (   0.21,-128.11) (   0.82,-125.53)  295.64                80
 08/16/2021   10:21:17   (  -0.23,-128.22) (   0.30,-130.71)  283.32                80
 08/17/2021   10:04:58   (  -0.23,-128.23) (  -0.70,-126.11)  241.00                80
 08/18/2021   22:23:54   (   0.25,-128.15) (  -0.46,-131.32)  361.57                80
 08/19/2021   22:07:35   (   0.24,-128.15) (   0.55,-126.73)  162.24                80
 08/21/2021   10:26:24   (  -0.26,-128.25) (   0.58,-131.91)  418.05                80