../ dmsp_15_ephemeris_20181231.txt 22-Jun-2023 00:39 109403 dmsp_16_ephemeris_20181231.txt 22-Jun-2023 00:39 109415 dmsp_17_ephemeris_20181231.txt 22-Jun-2023 00:39 109199 dmsp_18_ephemeris_20181231.txt 22-Jun-2023 00:39 109352