Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/13/2021   22:21:18   (   0.10,-128.41) (  -0.63,-131.76)  381.84                80
 03/14/2021   22:05:00   (   0.11,-128.42) (   0.39,-127.17)  141.80                80
 03/16/2021   10:26:27   (  -0.10,-128.40) (   0.81,-132.34)  450.04                80
 03/17/2021   10:04:51   (  -0.11,-128.40) (  -0.26,-127.77)   72.60                80
 03/19/2021   22:07:31   (   0.10,-128.43) (   0.13,-128.40)    5.15                80
 03/22/2021   10:12:41   (  -0.09,-128.40) (   0.06,-128.98)   66.01                80
 03/23/2021   09:51:04   (  -0.09,-128.39) (  -1.02,-124.40)  455.73                80
 03/24/2021   22:12:40   (   0.08,-128.40) (  -0.17,-129.61)  137.35                80
 03/25/2021   21:56:23   (   0.08,-128.40) (   0.86,-125.02)  384.83                80