../ dmsp_15_ephemeris_20211016.txt 22-Jun-2023 17:04 109500 dmsp_16_ephemeris_20211016.txt 22-Jun-2023 17:04 109607 dmsp_17_ephemeris_20211016.txt 22-Jun-2023 17:04 109515 dmsp_18_ephemeris_20211016.txt 22-Jun-2023 17:04 109511