../ dmsp_15_ephemeris_20180517.txt 22-Jun-2023 00:37 109547 dmsp_16_ephemeris_20180517.txt 22-Jun-2023 00:37 109493 dmsp_17_ephemeris_20180517.txt 22-Jun-2023 00:37 109728 dmsp_18_ephemeris_20180517.txt 22-Jun-2023 00:37 109729