../ dmsp_15_ephemeris_20210913.txt 22-Jun-2023 00:48 109657 dmsp_16_ephemeris_20210913.txt 22-Jun-2023 00:48 109609 dmsp_17_ephemeris_20210913.txt 22-Jun-2023 00:48 109577 dmsp_18_ephemeris_20210913.txt 22-Jun-2023 00:48 109557