Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/13/2021   09:59:21   (   0.25,-128.06) (  -0.04,-126.73)  152.07                80
 01/14/2021   22:23:38   (  -0.29,-128.08) (  -1.17,-131.93)  439.35                80
 01/15/2021   22:02:01   (  -0.27,-128.06) (  -0.12,-127.35)   80.52                80
 01/18/2021   10:07:12   (   0.29,-127.96) (   0.30,-127.94)    2.27                80
 01/20/2021   22:09:52   (  -0.31,-127.96) (  -0.46,-128.57)   70.12                80
 01/21/2021   21:48:15   (  -0.29,-127.93) (   0.60,-123.99)  449.43                80
 01/23/2021   10:12:23   (   0.33,-127.84) (   0.63,-129.16)  150.13                80
 01/24/2021   09:50:46   (   0.31,-127.82) (  -0.43,-124.58)  369.12                80
 01/25/2021   22:15:03   (  -0.35,-127.82) (  -0.80,-129.79)  223.90                80
 01/26/2021   21:53:26   (  -0.33,-127.79) (   0.27,-125.21)  294.91                80