../ dmsp_15_ephemeris_20200421.txt 22-Jun-2023 00:43 109669 dmsp_16_ephemeris_20200421.txt 22-Jun-2023 00:43 109678 dmsp_17_ephemeris_20200421.txt 22-Jun-2023 00:43 109614 dmsp_18_ephemeris_20200421.txt 22-Jun-2023 00:43 109618