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Astronomical Twilight: Go Dark, Look Up, Get Into Bed
astronomical
Dark skies are a resource, and you can lose them with one flashlight. Preparing before the dark arrives means you can enjoy it without fumbling. Getting your sleep system right at this step is what makes the night comfortable, since the coldest part of the night is still ahead.
Examples of gear this phase leans on, named as examples and not as a promise about any brand. A tent you can see the sky from: the Twilight Series features Sky View Tents, which have a wide-aperture mesh canopy for stargazing from bed. See Sky View Tents: {{SKYVIEW_PARTNER_URL}}. Basics: a red-light headlamp, a printed or offline map, a compass, a star map or an offline star app, a sleeping pad with a rating that matches the weather, and warm sleep layers. If you are not ready for a new tent yet, you can do all of this in the tent you have. Roll back the fly on a clear night and look up.
A mesh canopy or half-rolled fly does not keep out rain, wind or cold. Check the forecast and be ready to close it. Stay inside your known camp area. Do not wander off in the dark to find a better view without a plan, a red light and someone who knows where you are. In bear country, keep food and scented items stored the way the area requires, even if you are sleeping with the sky open. Do not use a heat source such as a stove or flame inside the tent.
12 to 18 degrees below the horizon
About 60 to 90 minutes after sunset
By the end of this phase the sky is as dark as it will get for the night. This is when the faint stars show up, when your eyes finish adjusting, and when a stray light can spoil everyone's view. It is also the moment to get yourself into the tent and into your sleep system, warm and ready.
DARKNESS (zero stray light)
[ ] Put your phone on its lowest brightness and night mode, or turn the screen off
[ ] Keep to red light, and keep it low and pointed down
[ ] Ask neighbors before using any bright light, and shield lanterns and campfire glow
[ ] Give your eyes time to adjust. It takes a while, so be patient and do not break it with white light
CELESTIAL ALIGNMENT
[ ] Night-Sky Topo Orientation: with your map or app dimmed, match the land around you to the sky. Find north, then pick a few bright stars or constellations as landmarks
[ ] Note where the horizon is open and where trees or ridges block the view
[ ] Check the moon phase and moonrise for tonight. A bright moon washes out faint stars
[ ] Decide where you will lie or sit to look up, and put a pad or chair there
TENT INGRESS
[ ] Tent Rainfly Half-Roll: roll back part of the fly if the weather is clear and calm, so you can see the sky from inside. Be ready to close it fast if the weather changes
[ ] Boot Lacing Prep: leave boots loosened and open, by the door, with socks tucked in, so you can step out at night without fumbling
[ ] Leave your headlamp, a water bottle and a layer in a pocket you can reach in the dark
[ ] Check the forecast for wind, rain and temperature drops before you roll anything back
[ ] Close the fly fully if wind picks up, rain starts or you feel cold air pouring in
SLEEP INSULATION
[ ] Pad R-Value Check: look at your pad's rating and compare it to tonight's expected low. Add a second pad or a layer under you if it falls short
[ ] Put on a dry hat and dry socks
[ ] Use the bathroom before you settle in, so you do not have to leave a warm bag at 2 a.m.
[ ] Make sure the tent has some airflow so moisture does not build up inside
12 to 18 degrees below the horizon