Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 6 22.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(TERRA) TERRA Lat/Lon    Distance(km)  Time Diff(sec)
 06/22/2021   22:26:52   (  69.90,-157.08) 06/22/2021   22:27:58  (  69.89,-157.08)    0.86                66
 06/22/2021   23:17:33   ( -69.80,  10.40) 06/22/2021   23:17:28  ( -69.78,  10.39)    2.20                 5
 06/23/2021   00:08:11   (  69.37, 178.33) 06/23/2021   00:06:59  (  69.45, 177.60)   30.01                72
 06/25/2021   14:43:12   (  69.97, -41.24) 06/25/2021   14:44:23  (  69.98, -41.09)    5.72                71
 06/25/2021   15:33:52   ( -69.80, 126.33) 06/25/2021   15:33:54  ( -69.81, 126.32)    0.82                 2
 06/25/2021   16:24:35   (  69.65, -66.13) 06/25/2021   16:23:22  (  69.64, -66.26)    5.11                73
 06/28/2021   06:59:36   (  70.24,  74.28) 06/28/2021   07:00:47  (  70.11,  74.98)   30.54                71
 06/28/2021   07:50:11   ( -69.81,-117.74) 06/28/2021   07:50:20  ( -69.84,-117.77)    2.90                 9
 06/28/2021   08:40:55   (  69.72,  49.71) 06/28/2021   08:39:47  (  69.72,  49.72)    0.63                68
 06/30/2021   23:15:58   (  70.47,-170.14) 06/30/2021   23:17:07  (  70.40,-168.72)   53.50                69
 07/01/2021   00:06:30   ( -69.87,  -1.89) 07/01/2021   00:06:45  ( -69.86,  -1.86)    2.18                15
 07/01/2021   00:57:13   (  69.74, 165.63) 07/01/2021   00:56:12  (  69.74, 165.63)    0.56                61
 07/03/2021   15:32:22   (  70.75, -54.65) 07/03/2021   15:33:29  (  70.63, -52.50)   80.43                67
 07/03/2021   16:22:49   ( -69.88, 114.04) 07/03/2021   16:23:11  ( -69.87, 114.04)    1.30                22
 07/03/2021   17:13:32   (  69.75, -78.46) 07/03/2021   17:12:38  (  69.75, -78.48)    0.78                54
 07/06/2021   08:39:08   ( -69.89,-130.04) 07/06/2021   08:39:37  ( -69.88,-130.06)    1.74                29
 07/06/2021   09:29:51   (  69.77,  37.46) 07/06/2021   09:29:04  (  69.76,  37.41)    2.05                47