Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/10/2021   10:23:18   (  -0.06,-128.00) (   0.69,-131.43)  390.19                80
 07/11/2021   10:06:59   (  -0.05,-127.97) (  -0.30,-126.83)  129.29                80
 07/12/2021   22:25:55   (   0.07,-127.83) (  -0.87,-132.04)  479.96                80
 07/13/2021   22:09:37   (   0.06,-127.79) (   0.13,-127.44)   39.50                80
 07/16/2021   10:09:27   (  -0.07,-127.78) (  -0.03,-128.04)   29.03                80
 07/17/2021   09:53:08   (  -0.06,-127.74) (  -1.02,-123.44)  489.96                80
 07/18/2021   22:12:05   (   0.08,-127.59) (  -0.14,-128.65)  120.50                80
 07/19/2021   21:55:46   (   0.07,-127.54) (   0.86,-124.05)  398.00                80
 07/21/2021   10:14:33   (  -0.10,-127.55) (   0.30,-129.23)  191.28                80
 07/22/2021   09:58:16   (  -0.09,-127.50) (  -0.75,-124.64)  326.71                80