../ dmsp_15_ephemeris_20171231.txt 22-Jun-2023 00:36 109377 dmsp_16_ephemeris_20171231.txt 22-Jun-2023 00:36 109401 dmsp_17_ephemeris_20171231.txt 22-Jun-2023 00:36 109336 dmsp_18_ephemeris_20171231.txt 22-Jun-2023 00:36 109289