Sunrise and Sunset at the Equator
Mia Chow · · Updated · Estimated reading time: 4 minutes
If you lived exactly on the equator, your sunrise and sunset would land at almost the same clock time in January as in July. No long summer evenings, no dark winter afternoons, just the same steady rhythm, day after day, all year long.
The day lasts between 12 h 6 min and 12 h 8 min all year, yet sunrise still moves by about 31 minutes: the Earth’s tilt and its elliptical orbit make solar noon drift through the year (the equation of time).
Everywhere else on Earth, the length of the day swings back and forth with the seasons. The equator is the one place where it barely moves at all. Here is what makes it so unusual.
Why the Day Is Always About 12 Hours
As the Earth travels around the Sun, its axis stays tilted at about 23.5 degrees. That tilt is what gives most of the planet its seasons: for half the year your hemisphere leans toward the Sun and gets long days, and for the other half it leans away and gets short ones.
The equator sits exactly halfway between the two poles, so it never leans strongly one way or the other. No matter where the Earth is in its orbit, the Sun's daily path is split almost evenly by the horizon, roughly half above it and half below. Of course, it is the Earth’s rotation that carries us past the Sun; we speak of the Sun’s path because that is what we see from the ground. The result is a day that is close to 12 hours long every single day of the year.
It is not exactly 12 hours, though. Thanks to the bending of light in the atmosphere and the fact that "sunrise" is measured from the top edge of the Sun rather than its center, the day at the equator actually runs a little long, about 12 hours and 7 minutes, year round. Every place on Earth gets a few extra minutes of daylight for the same reason, but at the equator it is one of the only things that changes.
In Quito the line is almost flat: between 12 h 6 min and 12 h 8 min of daylight every day of the year.
The Sun Rises and Sets Straight Up and Down
Near the poles, the Sun skims the horizon at a shallow angle, sliding sideways as it rises and sets. At the equator it does the opposite: the Sun climbs almost straight up from the horizon in the morning and drops straight down in the evening, at close to a right angle.
This vertical path has a surprising and very noticeable consequence after dark.
Looking west at the equinoxes, the Sun meets the horizon at 90° minus the latitude: almost vertically at the equator, at a slant far from it, and leaning the other way south of the equator.
Twilight Is the Shortest on Earth
Because the Sun sinks straight down instead of gliding along the horizon, it passes through the twilight zone quickly. At high latitudes, dusk can linger for an hour or more; at the equator it is over in a flash. Civil twilight, the soft usable light right after sunset, lasts only a little over 20 minutes here, about as short as it ever gets anywhere on the planet.
If you have ever heard travelers say that in the tropics "the Sun just drops and it is night," this is why. Our page on how long after sunset it gets dark walks through the stages of dusk in more detail, and you can look up the exact sunset and twilight times for any city using the search box at the top of this page.
No Longest or Shortest Day
Because every day is close to 12 hours, the equator has no real longest or shortest day. The solstices, which are such a big deal elsewhere, pass almost unnoticed. There is no midsummer with light until late at night and no midwinter with darkness by mid-afternoon.
In a sense, every day at the equator is a bit like an equinox, the moment when the whole planet gets a near-equal split of day and night. If you want to see the other extreme, read about the shortest day of the year and how dramatically it differs the farther you travel from the equator.
The Sun Passes Directly Overhead Twice a Year
The equator has one more trick that most of the world never sees. Around the March and September equinoxes, the midday Sun climbs all the way to the zenith, the point straight overhead. For a few minutes at local noon, a vertical pole casts almost no shadow at all, and your own shadow shrinks to a small pool around your feet.
This only happens in the tropics, where the Sun passes overhead twice a year everywhere between the two tropic lines (and once a year on the lines themselves); what is special at the equator is that those two days are the equinoxes, spaced six months apart. It is one of those simple things that feels genuinely strange the first time you notice it.