Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 12.  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) (   0.26,-129.23)  129.03                80
 04/13/2021   09:52:44   (  -0.01,-128.07) (  -0.76,-124.64)  390.41                80
 04/14/2021   22:14:20   (   0.00,-128.03) (  -0.40,-129.85)  207.67                80
 04/15/2021   21:58:02   (   0.01,-128.00) (   0.63,-125.26)  312.18                80
 04/17/2021   10:19:31   (   0.00,-127.96) (   0.55,-130.44)  282.75                80
 04/18/2021   09:57:53   (  -0.00,-127.92) (  -0.48,-125.85)  235.92                80
 04/19/2021   22:19:29   (  -0.01,-127.86) (  -0.73,-131.05)  364.55                80
 04/20/2021   22:03:11   (  -0.01,-127.82) (   0.30,-126.47)  154.59                80
 04/22/2021   10:24:39   (   0.02,-127.78) (   0.88,-131.64)  440.15                80
 04/23/2021   10:03:02   (   0.01,-127.74) (  -0.14,-127.05)   77.99                80
 04/25/2021   22:05:40   (  -0.01,-127.62) (  -0.04,-127.67)    5.96                80