Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/22/2021   10:12:41   (  -0.08,-128.39) (   0.02,-128.98)   66.35                80
 03/23/2021   09:51:04   (  -0.09,-128.39) (  -1.00,-124.39)  455.30                80
 03/24/2021   22:12:40   (   0.07,-128.39) (  -0.19,-129.60)  138.32                80
 03/25/2021   21:56:23   (   0.08,-128.38) (   0.83,-125.01)  383.70                80
 03/27/2021   10:17:51   (  -0.06,-128.36) (   0.33,-130.19)  208.94                80
 03/28/2021   09:56:13   (  -0.07,-128.34) (  -0.68,-125.61)  312.09                80
 03/29/2021   22:17:50   (   0.06,-128.33) (  -0.49,-130.82)  283.36                80
 03/30/2021   22:01:32   (   0.07,-128.32) (   0.53,-126.23)  238.04                80
 04/01/2021   10:23:01   (  -0.05,-128.29) (   0.64,-131.41)  354.77                80
 04/02/2021   10:01:23   (  -0.06,-128.27) (  -0.38,-126.82)  165.44                80