Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/28/2021   22:22:21   (   0.15,-127.73) (  -0.60,-131.07)  380.11                80
 07/29/2021   22:06:03   (   0.14,-127.76) (   0.46,-126.48)  146.84                80
 07/31/2021   10:24:50   (  -0.16,-127.92) (   0.71,-131.66)  426.56                80
 08/01/2021   10:08:33   (  -0.15,-127.95) (  -0.35,-127.07)  100.05                80
 08/03/2021   22:11:11   (   0.17,-127.91) (   0.21,-127.69)   24.71                80
 08/06/2021   10:11:02   (  -0.18,-128.08) (  -0.15,-128.29)   24.40                80
 08/08/2021   22:13:38   (   0.20,-128.02) (  -0.03,-128.90)  101.11                80
 08/09/2021   21:57:21   (   0.19,-128.04) (   1.03,-124.32)  424.33                80