This web site lists sun and moon phases.http://aa.usno.navy.mil/data/docs/RS_OneDay.php
Civil twilight in summer means, "it's getting light out better get up the trail before the sun hits me". In winter, "come on sun I'm freezing my tail off!".
Although higher up on the mountain might vary here are the stats for Lone Pine, CA for Sept. 29th.
Begin civil twilight 6:21 a.m.
Sunrise 6:46 a.m.
Sun transit 12:42 p.m.
Sunset 6:38 p.m.
End civil twilight 7:03 p.m.
Moonrise 5:44 p.m. on preceding day
Moon transit 11:59 p.m. on preceding day
Moonset 6:22 a.m.
Moonrise 6:14 p.m.
Moonset 7:21 a.m. on following day