../ dmsp_15_ephemeris_20191231.txt 22-Jun-2023 00:42 109473 dmsp_16_ephemeris_20191231.txt 22-Jun-2023 00:42 109372 dmsp_17_ephemeris_20191231.txt 22-Jun-2023 00:42 109327 dmsp_18_ephemeris_20191231.txt 22-Jun-2023 00:42 109303