../ dmsp_15_ephemeris_20210819.txt 22-Jun-2023 16:36 109560 dmsp_16_ephemeris_20210819.txt 22-Jun-2023 16:36 109627 dmsp_17_ephemeris_20210819.txt 22-Jun-2023 16:36 109714 dmsp_18_ephemeris_20210819.txt 22-Jun-2023 16:36 109505