../ dmsp_15_ephemeris_20210518.txt 22-Jun-2023 00:47 109541 dmsp_16_ephemeris_20210518.txt 22-Jun-2023 00:47 109621 dmsp_17_ephemeris_20210518.txt 22-Jun-2023 00:47 109661 dmsp_18_ephemeris_20210518.txt 22-Jun-2023 00:47 109519