Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/06/2021   10:28:10   (  -0.01,-128.23) (   0.96,-132.61)  499.38                80
 04/07/2021   10:06:32   (  -0.02,-128.20) (  -0.06,-128.02)   20.69                80
 04/09/2021   22:09:11   (   0.02,-128.16) (  -0.08,-128.64)   54.69                80
 04/10/2021   21:52:53   (   0.02,-128.15) (   0.94,-124.06)  466.12                80
 04/12/2021   10:14:22   (  -0.01,-128.11) (   0.23,-129.23)  128.39                80
 04/13/2021   09:52:44   (  -0.02,-128.08) (  -0.79,-124.65)  391.31                80
 04/14/2021   22:14:20   (   0.01,-128.04) (  -0.42,-129.85)  206.26                80
 04/15/2021   21:58:03   (   0.02,-128.02) (   0.66,-125.27)  313.91                80
 04/17/2021   10:19:30   (  -0.00,-127.98) (   0.57,-130.44)  280.68                80
 04/18/2021   09:57:54   (  -0.01,-127.94) (  -0.51,-125.86)  238.28                80
 04/19/2021   22:19:29   (  -0.00,-127.89) (  -0.70,-131.06)  361.72                80