Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/23/2021   10:02:37   (   0.37,-127.82) (  -0.25,-125.16)  303.50                80
 09/24/2021   22:21:32   (  -0.35,-127.74) (  -0.93,-130.37)  299.65                80
 09/25/2021   22:05:14   (  -0.36,-127.70) (   0.08,-125.77)  219.97                80
 09/27/2021   10:24:01   (   0.33,-127.67) (   1.06,-130.95)  372.94                80
 09/28/2021   10:07:43   (   0.34,-127.64) (   0.04,-126.35)  146.41                80
 09/29/2021   22:26:38   (  -0.32,-127.54) (  -1.22,-131.56)  457.84                80
 09/30/2021   22:10:20   (  -0.32,-127.50) (  -0.21,-126.96)   60.98                80
 10/03/2021   10:10:08   (   0.31,-127.42) (   0.33,-127.55)   14.47                80
 10/05/2021   22:12:45   (  -0.29,-127.27) (  -0.49,-128.16)  100.61                80
 10/06/2021   21:56:27   (  -0.30,-127.23) (   0.52,-123.56)  417.80                80