Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 11 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 11/23/2021   10:49:08   (   0.01,-137.21) (  -0.19,-136.27)  106.76                80
 11/25/2021   22:50:39   (  -0.00,-137.20) (  -0.02,-137.27)    7.40                80
 11/26/2021   22:34:58   (  -0.01,-137.20) (   0.96,-132.82)  498.61                80
 11/28/2021   10:54:41   (   0.00,-137.20) (   0.24,-138.23)  117.47                80
 11/29/2021   10:39:00   (   0.00,-137.19) (  -0.78,-133.79)  387.96                80
 11/30/2021   22:58:54   (  -0.00,-137.17) (  -0.47,-139.23)  234.36                80
 12/01/2021   22:43:13   (  -0.00,-137.16) (   0.53,-134.79)  270.49                80
 12/03/2021   11:02:58   (   0.00,-137.15) (   0.69,-140.19)  347.39                80
 12/04/2021   10:44:37   (   0.01,-137.13) (  -0.28,-135.75)  156.54                80
 12/05/2021   23:07:12   (  -0.00,-137.10) (  -0.92,-141.21)  468.38                80
 12/06/2021   22:51:33   (  -0.00,-137.07) (   0.08,-136.77)   34.93                80