Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/18/2020   09:52:22   (   0.07,-128.22) (  -0.61,-125.20)  343.90                80
 12/19/2020   22:16:38   (  -0.11,-128.25) (  -0.60,-130.41)  246.14                80
 12/20/2020   21:55:01   (  -0.08,-128.26) (   0.45,-125.83)  276.50                80
 12/22/2020   10:19:11   (   0.12,-128.25) (   0.71,-131.02)  314.95                80
 12/23/2020   09:57:34   (   0.10,-128.26) (  -0.34,-126.44)  207.88                80
 12/24/2020   22:21:49   (  -0.14,-128.29) (  -0.92,-131.63)  382.17                80
 12/25/2020   22:00:13   (  -0.12,-128.29) (   0.13,-127.06)  140.10                80
 12/27/2020   10:24:22   (   0.16,-128.27) (   1.04,-132.24)  452.64                80
 12/28/2020   10:02:46   (   0.14,-128.27) (  -0.02,-127.66)   69.46                80
 12/30/2020   22:08:05   (  -0.17,-128.29) (  -0.19,-128.28)    2.25                80