Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/12/2021   10:14:21   (  -0.00,-128.10) (   0.24,-129.23)  129.10                80
 04/13/2021   09:52:44   (  -0.01,-128.07) (  -0.79,-124.64)  390.37                80
 04/14/2021   22:14:19   (   0.00,-128.03) (  -0.43,-129.84)  207.60                80
 04/15/2021   21:58:02   (   0.01,-128.00) (   0.60,-125.26)  312.30                80
 04/17/2021   10:19:30   (   0.00,-127.96) (   0.57,-130.43)  282.63                80
 04/18/2021   09:57:53   (  -0.00,-127.92) (  -0.45,-125.85)  236.08                80
 04/19/2021   22:19:29   (  -0.01,-127.86) (  -0.70,-131.06)  364.30                80
 04/20/2021   22:03:12   (  -0.00,-127.83) (   0.33,-126.47)  154.93                80
 04/22/2021   10:24:39   (   0.02,-127.78) (   0.91,-131.64)  439.83                80
 04/23/2021   10:03:01   (   0.01,-127.74) (  -0.12,-127.05)   78.40                80