How Sunrise and Sunset Times Change Throughout the Year

If you check the sunrise and sunset times for your city every day, you’ll notice they shift constantly. Sunrise creeps earlier in spring, then reverses course in summer. Sunset pushes later, then earlier again. The amount of daylight you get changes by several hours over the course of a year — and the rate of change isn’t even constant. Understanding why this happens requires looking at how the Earth moves through space and how that motion translates into the sunlight patterns we experience on the ground.

The Core Mechanism: Earth’s Axial Tilt

Earth’s rotation axis is tilted approximately 23.44° relative to the plane of its orbit around the sun. This tilt is the single most important factor driving seasonal changes in sunrise and sunset times. As Earth orbits the sun over the course of a year, the tilt causes different hemispheres to lean toward or away from the sun.

When the Northern Hemisphere tilts toward the sun (roughly March through September), the sun’s path across the sky is higher and longer. This means:

• The sun rises earlier and sets later, producing longer days.
• The sun climbs higher at midday, intensifying sunlight.
• The rate of daylight change varies by date and latitude.

When the Northern Hemisphere tilts away from the sun (roughly October through February), the opposite occurs — shorter days, lower sun paths, and less total daylight.

The tilt itself doesn’t change over human timescales. What changes is Earth’s position in its orbit, which determines which hemisphere faces the sun more directly.

The Four Key Dates

Summer Solstice (Around June 20–21)

The summer solstice is when the Northern Hemisphere’s tilt toward the sun is maximized. On this date:

• Daylight hours reach their annual maximum.
• The sun rises at its most northeasterly point on the horizon and sets at its most northwesterly.
• Solar noon altitude is at its peak — the sun is as high in the sky as it gets all year.
• In far northern locations (above the Arctic Circle, ~66.5°N), the sun doesn’t set at all — the midnight sun phenomenon.

For a city like New York (40.7°N), the summer solstice brings about 15 hours and 5 minutes of daylight. For Anchorage, Alaska (61.2°N), it’s over 19 hours. For Miami (25.8°N), it’s about 13 hours and 45 minutes.

Winter Solstice (Around December 21–22)

The winter solstice is the mirror image. The Northern Hemisphere is tilted away from the sun at its maximum angle:

• Daylight hours hit their annual minimum.
• The sun rises at its most southeasterly point and sets at its most southwesterly.
• Solar noon altitude is at its lowest.
• Above the Arctic Circle, the sun doesn’t rise — polar night.

New York gets about 9 hours and 15 minutes of daylight. Anchorage gets less than 5.5 hours. Miami still gets about 10 hours and 32 minutes — the closer you are to the equator, the less dramatic the seasonal swing.

Equinoxes (Around March 20 and September 22)

The equinoxes are the two dates when neither hemisphere is tilted toward or away from the sun. On these dates:

• Day and night are approximately equal in length everywhere on Earth (close to 12 hours each, though atmospheric refraction makes the actual day slightly longer).
• The sun rises almost exactly due east and sets almost exactly due west.
• The rate of daylight change is at its fastest — days are getting longer or shorter most rapidly near the equinoxes.

The vernal (spring) equinox marks the start of lengthening days in the Northern Hemisphere. The autumnal (fall) equinox marks the start of shortening days.

Why the Rate of Change Isn’t Constant

One of the more counterintuitive aspects of sunrise and sunset timing is that daylight doesn’t increase or decrease at a steady rate. The change is fastest around the equinoxes and slowest around the solstices.

Here’s why: near the solstices, the sun’s declination (its angular position north or south of the celestial equator) is changing very slowly — it’s near its maximum or minimum, essentially “turning around.” Since the declination is barely moving, sunrise and sunset times change only a minute or two per day.

Near the equinoxes, the sun’s declination is changing most rapidly as it crosses the celestial equator. This means sunrise and sunset times shift by 2–3 minutes per day or more, depending on latitude.

For a mid-latitude US city, you might experience:

• Near the equinoxes: 2–3 minutes of daylight gained or lost per day.
• Near the solstices: Less than 1 minute of daylight change per day.
• In between: A gradual transition between these rates.

At higher latitudes, these rates are amplified. In Anchorage, daylight can change by more than 5 minutes per day near the equinoxes.

Latitude: The Amplifier

Your latitude determines how dramatically sunrise and sunset times change throughout the year. This happens because the sun’s apparent path across the sky varies with latitude:

Near the Equator (0–25°N)

Cities like Honolulu (21.3°N) and the southernmost parts of Florida and Texas experience relatively modest seasonal variation. The difference between the longest and shortest days might be only 2–3 hours. Sunrise and sunset times shift gradually throughout the year, and the changes are less noticeable in daily life.

Mid-Latitudes (25–45°N)

Most of the contiguous United States falls in this range. Cities like Atlanta (33.7°N), Denver (39.7°N), and New York (40.7°N) experience a difference of about 5–6 hours between the longest and shortest days. The seasonal shift is clearly noticeable — long summer evenings versus early winter darkness.

Higher Latitudes (45–66°N)

Northern US cities like Seattle (47.6°N), Minneapolis (44.9°N), and especially Anchorage (61.2°N) experience dramatic seasonal swings. Anchorage’s longest day has over 19 hours of daylight; its shortest has under 5.5 hours — a difference of nearly 14 hours. At these latitudes, the rate of daily change near the equinoxes is also much more dramatic.

The Equation of Time: Why Noon Drifts

If you track solar noon (the moment the sun reaches its highest point each day) over a year, you’ll find it doesn’t happen at exactly 12:00 PM — and it drifts by as much as 16 minutes in either direction. This phenomenon, described by the “equation of time,” affects sunrise and sunset times as well.

Two factors cause this drift:

Earth’s Elliptical Orbit

Earth’s orbit is not a perfect circle — it’s an ellipse. Earth moves faster when closer to the sun (perihelion, around January 3) and slower when farther away (aphelion, around July 4). This means the rate at which the sun appears to move across the sky varies throughout the year.

The Obliquity Effect

Because Earth’s axis is tilted, the sun’s apparent motion along the celestial equator (which is what clocks track) is not uniform. Even if Earth had a perfectly circular orbit, the tilt alone would cause solar noon to drift.

These two effects combine to create the equation of time — an asymmetric, figure-eight-shaped correction that causes solar noon to be as much as 16 minutes early (in November) or 14 minutes late (in February) relative to clock noon.

This drift directly affects sunrise and sunset times. It’s part of the reason why the earliest sunset in winter doesn’t coincide with the winter solstice, and the latest sunrise doesn’t either. In the Northern Hemisphere, the earliest sunset typically occurs around December 7–8 (about two weeks before the solstice), while the latest sunrise occurs around January 3–5 (about two weeks after).

Why Earliest Sunset and Latest Sunrise Don’t Match the Solstice

This is one of the most commonly asked questions about sunrise and sunset timing, so it’s worth emphasizing.

The winter solstice has the fewest hours of total daylight. But “fewest hours of daylight” doesn’t mean “earliest sunset” or “latest sunrise” — it means the smallest gap between the two.

The equation of time causes solar noon to shift over the weeks surrounding the solstice. In early December, solar noon is getting earlier (due to the equation of time). This pulls both sunrise and sunset earlier. The result is that sunset reaches its earliest point before the solstice, while sunrise doesn’t reach its latest point until after.

The same effect works in reverse around the summer solstice, though it’s less pronounced and shifts by only a few days rather than two weeks.

Atmospheric Refraction: Why the Sun Isn’t Where It Looks

One subtle but real factor is atmospheric refraction. The atmosphere bends sunlight, making the sun appear higher on the horizon than it actually is. At the horizon, this effect is about 0.57° — more than the sun’s apparent diameter. This means:

• You can see the sun before it has geometrically risen above the horizon.
• You can still see the sun after it has geometrically set.

The practical effect is that every day has about 6–8 extra minutes of visible sunlight compared to purely geometric calculations. This refraction is already accounted for in the sunrise and sunset times shown by astronomical tools and services, including the calculations on todaysuntimes.com.

Refraction varies slightly with temperature and atmospheric pressure, which is why sunrise and sunset times are accurate to about 1–2 minutes but rarely exact to the second.

Daylight Saving Time: A Human Complication

Daylight Saving Time (DST) doesn’t change the amount of sunlight — it shifts the clock relative to solar events. When clocks spring forward in March, sunrise and sunset both appear one hour later by the clock. When clocks fall back in November, they appear one hour earlier.

DST was designed to align waking hours with daylight, particularly in the evening. Its effects on perceived sunrise and sunset times can be confusing:

• In early spring (just after DST starts), sunrise may feel very late because the clock jumped forward.
• In late fall (just after DST ends), sunset feels abruptly early — even though the actual amount of daylight only changed by a minute or two from the previous day.

When looking up sunrise and sunset times, always check whether the times are shown in standard time or local time (which includes DST). Tools that use your city’s timezone automatically, like todaysuntimes.com, handle this correctly.

Tracking the Changes

If you look up sunrise and sunset times for your city today and again in a few weeks, you’ll see the shift firsthand. In spring, you’ll notice sunset pushing later and sunrise pulling earlier. In fall, the reverse.

Here’s a rough calendar of what to expect in the Northern Hemisphere:

Period	Daylight Trend	Rate of Change
January–March	Increasing	Accelerating (fastest near equinox)
March–June	Increasing	Decelerating (slowing toward solstice)
June–September	Decreasing	Accelerating (fastest near equinox)
September–December	Decreasing	Decelerating (slowing toward solstice)

The continuous interplay of axial tilt, orbital mechanics, atmospheric refraction, and timezone conventions produces the sunrise and sunset patterns we experience every day. What seems like a simple question — “when does the sun rise?” — turns out to involve a surprisingly rich set of physical phenomena.