../ dmsp_15_ephemeris_20170531.txt 22-Jun-2023 00:34 109569 dmsp_16_ephemeris_20170531.txt 22-Jun-2023 00:34 109566 dmsp_17_ephemeris_20170531.txt 22-Jun-2023 00:34 109571 dmsp_18_ephemeris_20170531.txt 22-Jun-2023 00:34 109567