Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/21/2021   10:50:56   (  -0.03,-137.22) (   0.35,-138.85)  185.71                80
 01/22/2021   10:29:20   (  -0.02,-137.22) (  -0.71,-134.27)  336.70                80
 01/23/2021   22:50:56   (   0.01,-137.21) (  -0.52,-139.48)  258.43                80
 01/24/2021   22:34:39   (  -0.02,-137.21) (   0.48,-134.89)  264.13                80
 01/26/2021   10:56:07   (   0.01,-137.19) (   0.69,-140.07)  328.27                80
 01/27/2021   10:34:31   (   0.01,-137.18) (  -0.38,-135.49)  192.97                80
 01/28/2021   22:56:08   (  -0.01,-137.16) (  -0.79,-140.71)  404.20                80
 01/29/2021   22:39:50   (  -0.01,-137.14) (   0.21,-136.12)  116.80                80
 01/31/2021   11:01:19   (   0.01,-137.12) (   0.95,-141.30)  476.45                80
 02/01/2021   10:39:41   (   0.01,-137.10) (  -0.05,-136.71)   44.28                80
 02/03/2021   22:42:22   (  -0.00,-137.05) (  -0.05,-137.35)   33.79                80