../ dmsp_15_ephemeris_20110720.txt 22-Jun-2023 00:18 109603 dmsp_16_ephemeris_20110720.txt 22-Jun-2023 00:18 109681 dmsp_17_ephemeris_20110720.txt 22-Jun-2023 00:18 109687 dmsp_18_ephemeris_20110720.txt 22-Jun-2023 00:18 109792