../ dmsp_15_ephemeris_20111218.txt 22-Jun-2023 00:19 109344 dmsp_16_ephemeris_20111218.txt 22-Jun-2023 00:19 109219 dmsp_17_ephemeris_20111218.txt 22-Jun-2023 00:19 109331 dmsp_18_ephemeris_20111218.txt 22-Jun-2023 00:19 109453