../ dmsp_15_ephemeris_20210312.txt 22-Jun-2023 16:35 108209 dmsp_16_ephemeris_20210312.txt 22-Jun-2023 16:35 108156 dmsp_17_ephemeris_20210312.txt 22-Jun-2023 16:35 108121 dmsp_18_ephemeris_20210312.txt 22-Jun-2023 16:35 108247