../ dmsp_15_ephemeris_20180518.txt 22-Jun-2023 00:37 109475 dmsp_16_ephemeris_20180518.txt 22-Jun-2023 00:37 109553 dmsp_17_ephemeris_20180518.txt 22-Jun-2023 00:37 109505 dmsp_18_ephemeris_20180518.txt 22-Jun-2023 00:37 109632