Simultaneous Nadir Overpasses (SNOs) Predictions

Prediction of SNOs between NOAA-21 and LANDSAT-9 Satellite Orbit:

Table of predicted SNOs for the next 14.0 days since TLE Epoch: 10/17/2025

Index	Date (NOAA-21)	Time (NOAA-21)	Lat,Lon (NOAA-21)	SZA (NOAA-21 )	Date (LANDSAT-9)	Time (LANDSAT-9)	Lat,Lon (LANDSAT-9)	SZA (LANDSAT-9 )	Distance(km)	Time Diff (sec)
1	10/18/2025	15:18:59	70.05, -53.36	79.80	10/18/2025	15:19:24	70.03, -53.41	79.78	3.32	25
2	10/18/2025	16:09:40	-69.95, 114.12	100.29	10/18/2025	16:08:53	-69.97, 114.14	100.27	2.94	47
3	10/21/2025	06:45:10	-70.45,-105.50	98.85	10/21/2025	06:46:21	-70.32,-104.75	98.98	31.70	71
4	10/21/2025	07:35:49	70.05, 62.43	80.76	10/21/2025	07:35:51	70.05, 62.50	80.76	2.56	2
5	10/21/2025	08:26:30	-69.94,-130.08	99.34	10/21/2025	08:25:21	-69.94,-130.02	99.34	2.45	69
6	10/23/2025	23:01:54	-70.09, 10.86	98.28	10/23/2025	23:02:53	-70.09, 10.81	98.27	2.05	59
7	10/23/2025	23:52:39	70.00, 178.30	81.65	10/23/2025	23:52:20	69.98, 178.29	81.63	2.04	19
8	10/24/2025	00:43:09	-69.31, -13.36	99.03	10/24/2025	00:41:59	-69.38, -14.89	98.96	60.56	70
9	10/26/2025	15:18:44	-70.04, 126.71	97.40	10/26/2025	15:19:21	-70.05, 126.64	97.39	2.98	37
10	10/26/2025	16:09:29	69.96, -65.85	82.54	10/26/2025	16:08:48	69.94, -65.88	82.51	2.96	41
11	10/29/2025	06:45:02	70.61, 74.30	84.06	10/29/2025	06:46:12	70.46, 75.49	83.91	47.00	70
12	10/29/2025	07:35:34	-70.01,-117.44	96.53	10/29/2025	07:35:48	-70.03,-117.50	96.51	3.15	14
13	10/29/2025	08:26:19	69.93, 49.98	83.41	10/29/2025	08:25:15	69.91, 49.98	83.38	2.19	64

Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 10/17/2025

Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 10/17/2025 in txt file.

Historial Predications of SNOs between NOAA-21 and LANDSAT-9