../ dmsp_15_ephemeris_20110518.txt 22-Jun-2023 00:17 109505 dmsp_16_ephemeris_20110518.txt 22-Jun-2023 00:17 109661 dmsp_17_ephemeris_20110518.txt 22-Jun-2023 00:17 109558 dmsp_18_ephemeris_20110518.txt 22-Jun-2023 00:17 109726