../ dmsp_15_ephemeris_20210510.txt 22-Jun-2023 00:47 109488 dmsp_16_ephemeris_20210510.txt 22-Jun-2023 00:47 109604 dmsp_17_ephemeris_20210510.txt 22-Jun-2023 00:47 109766 dmsp_18_ephemeris_20210510.txt 22-Jun-2023 00:47 109507