../ dmsp_15_ephemeris_20231121.txt 21-Jan-2024 22:00 243 dmsp_16_ephemeris_20231121.txt 21-Jan-2024 22:00 243 dmsp_17_ephemeris_20231121.txt 21-Jan-2024 22:00 243 dmsp_18_ephemeris_20231121.txt 21-Jan-2024 22:00 243