../ dmsp_15_ephemeris_20180510.txt 22-Jun-2023 00:37 109556 dmsp_16_ephemeris_20180510.txt 22-Jun-2023 00:37 109554 dmsp_17_ephemeris_20180510.txt 22-Jun-2023 00:37 109672 dmsp_18_ephemeris_20180510.txt 22-Jun-2023 00:37 109686