Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/09/2021   22:09:11   (   0.01,-128.16) (  -0.10,-128.64)   54.87                80
 04/10/2021   21:52:53   (   0.02,-128.14) (   0.93,-124.05)  465.76                80
 04/12/2021   10:14:21   (  -0.01,-128.10) (   0.24,-129.23)  129.01                80
 04/13/2021   09:52:44   (  -0.02,-128.07) (  -0.79,-124.64)  390.55                80
 04/14/2021   22:14:19   (   0.00,-128.03) (  -0.42,-129.84)  207.18                80
 04/15/2021   21:58:02   (   0.01,-128.01) (   0.61,-125.26)  312.82                80
 04/17/2021   10:19:30   (   0.00,-127.96) (   0.56,-130.44)  282.01                80
 04/18/2021   09:57:53   (  -0.01,-127.93) (  -0.46,-125.85)  236.79                80
 04/19/2021   22:19:28   (  -0.01,-127.87) (  -0.74,-131.05)  363.33                80
 04/20/2021   22:03:10   (  -0.00,-127.83) (   0.30,-126.46)  155.96                80
 04/22/2021   10:24:39   (   0.01,-127.79) (   0.88,-131.64)  438.66                80