Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/06/2021   10:01:51   (  -0.03,-128.13) (  -0.57,-125.63)  285.04                80
 07/07/2021   22:20:48   (   0.05,-128.00) (  -0.61,-130.83)  323.25                80
 07/08/2021   22:04:30   (   0.04,-127.97) (   0.44,-126.25)  196.67                80
 07/10/2021   10:23:17   (  -0.06,-128.00) (   0.70,-131.43)  390.26                80
 07/11/2021   10:06:59   (  -0.05,-127.97) (  -0.29,-126.83)  129.19                80
 07/12/2021   22:25:55   (   0.07,-127.83) (  -0.88,-132.04)  480.25                80
 07/13/2021   22:09:37   (   0.06,-127.79) (   0.12,-127.44)   39.22                80
 07/16/2021   10:09:27   (  -0.06,-127.78) (  -0.02,-128.03)   29.20                80
 07/17/2021   09:53:08   (  -0.05,-127.73) (  -1.02,-123.44)  489.74                80
 07/18/2021   22:12:04   (   0.08,-127.58) (  -0.14,-128.65)  120.90                80
 07/19/2021   21:55:46   (   0.07,-127.54) (   0.86,-124.05)  397.60                80