Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 10.  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   10:23:17   (  -0.06,-128.00) (   0.73,-131.42)  390.16                80
 07/11/2021   10:06:59   (  -0.06,-127.97) (  -0.32,-126.83)  129.35                80
 07/12/2021   22:25:56   (   0.07,-127.83) (  -0.85,-132.04)  479.88                80
 07/13/2021   22:09:37   (   0.06,-127.79) (   0.14,-127.45)   39.58                80
 07/16/2021   10:09:27   (  -0.07,-127.78) (  -0.04,-128.04)   28.97                80
 07/17/2021   09:53:09   (  -0.06,-127.74) (  -1.03,-123.44)  490.11                80
 07/18/2021   22:12:05   (   0.08,-127.59) (  -0.13,-128.65)  120.34                80
 07/19/2021   21:55:46   (   0.07,-127.55) (   0.86,-124.05)  398.18                80
 07/21/2021   10:14:34   (  -0.10,-127.56) (   0.30,-129.23)  191.07                80
 07/22/2021   09:58:16   (  -0.09,-127.51) (  -0.75,-124.64)  326.92                80
 07/23/2021   22:17:12   (   0.11,-127.35) (  -0.45,-129.84)  284.74                80