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Most default weather apps already show tonight's moon phase and moonrise time. Scroll down, it's usually already sitting there.
Nature Guide
When Is the Full Moon: A Quick Reference Chart
Full cycle29.5 days
Phases8
Full moons per year12 to 13
Looks full for~3 nights
Best time to watchmoonrise, at sunset
Cost$0
~2.5 yrs
How often you get a bonus full moon in the same calendar month, which is the actual definition of a blue moon.
Free stargazing is still one of my favorite plans, and the moon does something worth watching every single night whether you're paying attention or not. The names and dates get thrown around online with zero context, so here's the actual cycle: how long it takes, what each phase looks like, and how to check tonight's status in about ten seconds.
01 · The cycle
The 8 phases of the moon, in order
One full lap takes about 29.5 days. Here's what's actually happening at each stage and how long it sticks around.
New Moon
Day 0
Invisible
What's happening: the moon sits between Earth and the sun, so the lit side faces away from us. You won't see it at all, and that's completely normal.
Waxing Crescent
Days 1 to 6
Growing
What's happening: a thin sliver of light shows up low in the west just after sunset, and it gets a little bigger every night.
First Quarter
Day ~7
Half lit
What's happening: exactly half the face is lit. It sits high in the sky around sunset, which makes it the easiest quarter phase to catch on your way home from a shift.
Waxing Gibbous
Days 8 to 13
Over half
What's happening: more than half lit and still growing. It rises mid-afternoon and hangs around most of the night.
Full Moon
Days 14 to 15
100% lit
What's happening: fully lit, rises right as the sun sets, and stays up all night. This is the one everybody actually notices.
Waning Gibbous
Days 16 to 21
Shrinking
What's happening: still mostly lit but shrinking now, and it rises later each night after sunset.
Last Quarter
Day ~22
Half lit
What's happening: the other half is lit this time. It rises around midnight, so you need to be up late or up early to catch it.
Waning Crescent
Days 23 to 29
Almost gone
What's happening: a thin sliver again, this time visible before sunrise in the east. Then it resets to new and the whole cycle starts over.
02 · Names
This year's full moon names, decoded
Every month's full moon has a nickname, mostly pulled from old farming and hunting calendars. None of it is official astronomy, it's just folklore that stuck.
January: Wolf MoonNamed for wolves howling more during the deep-winter months.
February: Snow MoonTied to the heaviest average snowfall of the year in most of the US.
March: Worm MoonGround starts thawing, earthworms and beetle larvae show back up.
April: Pink MoonNamed for early spring wildflowers, not the moon's actual color.
May: Flower MoonPeak of spring blooming season.
June: Strawberry MoonStrawberry harvest season in the northeastern US.
July: Buck MoonDeer antlers are actively regrowing this time of year.
August: Sturgeon MoonSturgeon fish were easiest to catch in the Great Lakes.
September: Harvest MoonThe full moon closest to the fall equinox, extra bright to light up late harvests.
October: Hunter's MoonFollows the Harvest Moon, traditionally when hunting picked up for winter stores.
November: Beaver MoonWhen beavers finished their dams before the ponds froze over.
December: Cold MoonLongest nights of the year, pretty self-explanatory.
03 · Timeline
Where each stretch falls in the 29.5 day cycle
Zoom out and the whole month breaks into three rough chunks.
New Moon
Dark sky, invisible moon. This is where the whole cycle resets.
Waxing
Growing from a sliver to fully lit, roughly two weeks, ending at the full moon.
Waning
Shrinking back down from full to dark, another two weeks, and then it's new again.
04 · Find it
How to check tonight's phase without doing math
You don't need a whole app for this, just something that tells you what's up there tonight.
1x/yr
Farmers' Almanac
Publishes every full moon date and name for the whole year in advance, and it's still the most reliable free source going.
29.5
Count from the last new moon
Works if you actually know the last new moon date. Realistically, just use the app.
05 · Myths
Full moon myths worth retiring
A lot of what gets repeated about the full moon does not actually hold up.
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"It only lasts one night"
It looks full to the naked eye for about three nights in a row, not just the one.
It looks full to the naked eye for about three nights in a row, not just the one.
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"Full moons make people act unhinged"
No solid research backs a lunar effect on behavior or ER visits, it's folklore, not data.
No solid research backs a lunar effect on behavior or ER visits, it's folklore, not data.
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"You can't see it during the day"
Near moonrise or moonset it's often visible at dawn or dusk depending on the phase.
Near moonrise or moonset it's often visible at dawn or dusk depending on the phase.
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"A supermoon looks way bigger"
It's about 7% bigger and somewhat brighter, most people can't actually tell by eye.
It's about 7% bigger and somewhat brighter, most people can't actually tell by eye.
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"Every month has exactly one full moon"
Some months get two, that's a blue moon, and February can get skipped entirely since it's short.
Some months get two, that's a blue moon, and February can get skipped entirely since it's short.