Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/14/2021   22:05:00   (   0.11,-128.42) (   0.37,-127.17)  141.79                80
 03/16/2021   10:26:28   (  -0.10,-128.40) (   0.77,-132.35)  450.06                80
 03/17/2021   10:04:51   (  -0.11,-128.40) (  -0.24,-127.76)   72.53                80
 03/19/2021   22:07:30   (   0.10,-128.43) (   0.12,-128.39)    4.05                80
 03/22/2021   10:12:41   (  -0.09,-128.40) (   0.02,-128.99)   66.36                80
 03/23/2021   09:51:04   (  -0.09,-128.39) (  -1.00,-124.40)  455.38                80
 03/24/2021   22:12:40   (   0.08,-128.40) (  -0.19,-129.61)  137.81                80
 03/25/2021   21:56:23   (   0.08,-128.39) (   0.84,-125.02)  384.30                80
 03/27/2021   10:17:51   (  -0.07,-128.36) (   0.33,-130.20)  208.62                80