../ dmsp_15_ephemeris_20210503.txt 22-Jun-2023 00:47 109505 dmsp_16_ephemeris_20210503.txt 22-Jun-2023 00:47 109633 dmsp_17_ephemeris_20210503.txt 22-Jun-2023 00:47 109639 dmsp_18_ephemeris_20210503.txt 22-Jun-2023 00:47 109491