Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 11 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)
 11/09/2021   10:10:34   (   0.12,-128.45) (  -0.29,-126.76)  194.12                80
 11/10/2021   22:29:29   (  -0.09,-128.45) (  -0.89,-131.96)  400.95                80
 11/11/2021   22:13:11   (  -0.10,-128.44) (   0.14,-127.37)  122.73                80
 11/13/2021   10:31:57   (   0.07,-128.45) (   0.99,-132.54)  466.70                80
 11/14/2021   10:15:39   (   0.08,-128.44) (  -0.04,-127.95)   56.96                80
 11/16/2021   22:15:36   (  -0.07,-128.43) (  -0.09,-128.56)   14.39                80
 11/19/2021   10:18:03   (   0.06,-128.42) (   0.20,-129.14)   81.00                80
 11/20/2021   10:01:44   (   0.08,-128.41) (  -0.77,-124.53)  442.04                80
 11/21/2021   22:20:39   (  -0.05,-128.39) (  -0.37,-129.74)  154.20                80
 11/22/2021   22:04:21   (  -0.06,-128.38) (   0.67,-125.15)  368.47                80