../ dmsp_15_ephemeris_20181220.txt 22-Jun-2023 16:54 109398 dmsp_16_ephemeris_20181220.txt 22-Jun-2023 16:54 109321 dmsp_17_ephemeris_20181220.txt 22-Jun-2023 16:54 109267 dmsp_18_ephemeris_20181220.txt 22-Jun-2023 16:54 109261