../ dmsp_15_ephemeris_20180831.txt 22-Jun-2023 16:53 109609 dmsp_16_ephemeris_20180831.txt 22-Jun-2023 16:53 109471 dmsp_17_ephemeris_20180831.txt 22-Jun-2023 16:53 109848 dmsp_18_ephemeris_20180831.txt 22-Jun-2023 16:53 109704