../ dmsp_15_ephemeris_20210501.txt 22-Jun-2023 00:46 109656 dmsp_16_ephemeris_20210501.txt 22-Jun-2023 00:46 109648 dmsp_17_ephemeris_20210501.txt 22-Jun-2023 00:46 109645 dmsp_18_ephemeris_20210501.txt 22-Jun-2023 00:46 109534