../ dmsp_15_ephemeris_20210517.txt 22-Jun-2023 00:47 109514 dmsp_16_ephemeris_20210517.txt 22-Jun-2023 00:47 109578 dmsp_17_ephemeris_20210517.txt 22-Jun-2023 00:47 109612 dmsp_18_ephemeris_20210517.txt 22-Jun-2023 00:47 109427