../ dmsp_15_ephemeris_20210731.txt 22-Jun-2023 16:36 109556 dmsp_16_ephemeris_20210731.txt 22-Jun-2023 16:36 109653 dmsp_17_ephemeris_20210731.txt 22-Jun-2023 16:36 109722 dmsp_18_ephemeris_20210731.txt 22-Jun-2023 16:36 109485