../ dmsp_15_ephemeris_20171221.txt 22-Jun-2023 16:51 109460 dmsp_16_ephemeris_20171221.txt 22-Jun-2023 16:51 109468 dmsp_17_ephemeris_20171221.txt 22-Jun-2023 16:51 109251 dmsp_18_ephemeris_20171221.txt 22-Jun-2023 16:51 109373