Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 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)
 04/09/2021   22:09:11   (   0.01,-128.16) (  -0.07,-128.65)   54.96                80
 04/10/2021   21:52:54   (   0.02,-128.14) (   0.96,-124.06)  465.83                80
 04/12/2021   10:14:21   (  -0.01,-128.10) (   0.27,-129.22)  128.90                80
 04/13/2021   09:52:44   (  -0.02,-128.07) (  -0.81,-124.65)  390.74                80
 04/14/2021   22:14:20   (   0.01,-128.03) (  -0.40,-129.85)  206.92                80
 04/15/2021   21:58:02   (   0.01,-128.01) (   0.63,-125.26)  313.11                80
 04/17/2021   10:19:31   (  -0.00,-127.97) (   0.54,-130.44)  281.65                80
 04/18/2021   09:57:53   (  -0.01,-127.93) (  -0.48,-125.85)  237.19                80
 04/19/2021   22:19:28   (  -0.00,-127.87) (  -0.72,-131.06)  362.86                80
 04/20/2021   22:03:11   (   0.00,-127.84) (   0.31,-126.47)  156.47                80