../ dmsp_15_ephemeris_20210311.txt 22-Jun-2023 00:46 108228 dmsp_16_ephemeris_20210311.txt 22-Jun-2023 00:46 108152 dmsp_17_ephemeris_20210311.txt 22-Jun-2023 00:46 108204 dmsp_18_ephemeris_20210311.txt 22-Jun-2023 00:46 108218