../ dmsp_15_ephemeris_20180521.txt 22-Jun-2023 16:52 109490 dmsp_16_ephemeris_20180521.txt 22-Jun-2023 16:52 109494 dmsp_17_ephemeris_20180521.txt 22-Jun-2023 16:52 109594 dmsp_18_ephemeris_20180521.txt 22-Jun-2023 16:52 109673