Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/07/2021   10:06:32   (  -0.02,-128.20) (  -0.04,-128.01)   20.82                80
 04/09/2021   22:09:10   (   0.01,-128.16) (  -0.11,-128.64)   54.82                80
 04/10/2021   21:52:53   (   0.02,-128.14) (   0.92,-124.05)  465.93                80
 04/12/2021   10:14:21   (  -0.01,-128.10) (   0.25,-129.23)  128.70                80
 04/13/2021   09:52:44   (  -0.02,-128.07) (  -0.77,-124.64)  390.95                80
 04/14/2021   22:14:20   (   0.01,-128.04) (  -0.38,-129.86)  206.65                80
 04/15/2021   21:58:03   (   0.01,-128.01) (   0.64,-125.27)  313.44                80
 04/17/2021   10:19:31   (  -0.00,-127.97) (   0.53,-130.44)  281.25                80
 04/18/2021   09:57:53   (  -0.01,-127.94) (  -0.49,-125.86)  237.64                80
 04/19/2021   22:19:29   (  -0.00,-127.88) (  -0.71,-131.06)  362.37                80
 04/20/2021   22:03:11   (   0.00,-127.85) (   0.31,-126.47)  157.00                80