../ dmsp_15_ephemeris_20190418.txt 22-Jun-2023 16:55 109645 dmsp_16_ephemeris_20190418.txt 22-Jun-2023 16:55 109644 dmsp_17_ephemeris_20190418.txt 22-Jun-2023 16:55 109751 dmsp_18_ephemeris_20190418.txt 22-Jun-2023 16:55 109671