Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 6 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)
 06/11/2020   09:52:53   (   0.00,-127.84) (  -0.42,-126.01)  209.20                80
 06/12/2020   22:14:31   (  -0.02,-127.78) (  -0.80,-131.23)  393.70                80
 06/13/2020   21:58:16   (  -0.01,-127.75) (   0.26,-126.66)  124.86                80
 06/15/2020   10:19:44   (   0.03,-127.72) (   0.98,-131.83)  469.45                80
 06/16/2020   09:58:09   (   0.02,-127.68) (  -0.09,-127.26)   48.29                80
 06/18/2020   22:00:51   (  -0.02,-127.57) (  -0.07,-127.91)   38.53                80
 06/19/2020   21:44:35   (  -0.01,-127.53) (   0.93,-123.33)  479.16                80
 06/21/2020   10:06:04   (   0.02,-127.49) (   0.25,-128.51)  116.47                80
 06/22/2020   09:44:28   (   0.01,-127.45) (  -0.76,-123.93)  400.21                80
 06/23/2020   22:06:07   (  -0.02,-127.35) (  -0.40,-129.16)  206.27                80
 06/24/2020   21:49:51   (  -0.01,-127.30) (   0.61,-124.58)  310.66                80