sports > backpacking
document updated 9 years ago, on Sep 26, 2014
List of to-dos, the night before a hike:

There are four different times given for sunset: [2] The amount of time between these varies as the length of the day itself varies: by season and latitude. It isn't simply "add 30 minutes to get one from the other", so consult the proper tables to know how long twilight lasts.