Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/13/2021   09:52:44   (  -0.01,-128.07) (  -0.80,-124.64)  390.52                80
 04/14/2021   22:14:19   (  -0.00,-128.03) (  -0.42,-129.84)  207.63                80
 04/15/2021   21:58:02   (   0.01,-128.00) (   0.61,-125.26)  312.20                80
 04/17/2021   10:19:30   (   0.01,-127.96) (   0.57,-130.43)  282.69                80
 04/18/2021   09:57:53   (  -0.00,-127.92) (  -0.46,-125.85)  235.96                80
 04/19/2021   22:19:28   (  -0.01,-127.85) (  -0.75,-131.05)  364.58                80
 04/20/2021   22:03:11   (  -0.01,-127.82) (   0.28,-126.46)  154.57                80
 04/22/2021   10:24:39   (   0.02,-127.78) (   0.90,-131.64)  440.16                80
 04/23/2021   10:03:01   (   0.01,-127.74) (  -0.12,-127.05)   77.99                80
 04/25/2021   22:08:19   (  -0.02,-127.62) (  -0.05,-127.66)    6.52                80