Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 25.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 12/25/2021   08:48:25   (  71.58,  46.29) 12/25/2021   08:49:28  (  71.59,  46.33)    1.84                63
 12/25/2021   09:39:08   ( -71.48,-146.21) 12/25/2021   09:38:58  ( -71.47,-146.24)    1.00                10
 12/25/2021   10:29:43   (  70.88,  22.13) 12/25/2021   10:28:34  (  70.89,  20.48)   60.38                69
 12/28/2021   00:15:34   ( -71.55,  -5.43) 12/28/2021   00:16:31  ( -71.57,  -5.47)    2.42                57
 12/28/2021   01:06:19   (  71.48, 162.00) 12/28/2021   01:05:58  (  71.47, 162.01)    1.12                21
 12/28/2021   01:56:47   ( -70.60, -29.16) 12/28/2021   01:55:41  ( -70.65, -31.65)   91.90                66
 12/30/2021   15:42:45   (  71.57, -57.23) 12/30/2021   15:43:31  (  71.56, -57.24)    1.09                46
 12/30/2021   16:33:28   ( -71.45, 110.29) 12/30/2021   16:33:01  ( -71.45, 110.20)    3.14                27
 01/02/2022   07:09:54   ( -71.58,-109.03) 01/02/2022   07:10:32  ( -71.58,-108.97)    2.19                38
 01/02/2022   08:00:38   (  71.47,  58.48) 01/02/2022   07:59:59  (  71.47,  58.50)    0.93                39
 01/04/2022   22:37:04   (  71.56,-160.77) 01/04/2022   22:37:32  (  71.54,-160.78)    2.62                28
 01/04/2022   23:27:48   ( -71.49,   6.68) 01/04/2022   23:27:01  ( -71.48,   6.76)    2.82                47
 01/07/2022   13:13:46   (  72.47, -21.59) 01/07/2022   13:14:51  (  72.35, -18.77)   96.04                65
 01/07/2022   14:04:13   ( -71.52, 147.53) 01/07/2022   14:04:34  ( -71.54, 147.46)    3.38                21
 01/07/2022   14:54:58   (  71.47, -45.07) 01/07/2022   14:54:00  (  71.49, -44.98)    3.60                58