../ dmsp_15_ephemeris_20210531.txt 22-Jun-2023 00:47 109557 dmsp_16_ephemeris_20210531.txt 22-Jun-2023 00:47 109577 dmsp_17_ephemeris_20210531.txt 22-Jun-2023 00:47 109566 dmsp_18_ephemeris_20210531.txt 22-Jun-2023 00:47 109496