How Long Do Solar Eclipses Last? 2023 BEST Guide

Chris Klein, Amateur Astronomy Advisor

By Chris Klein


Have you ever wondered about the mesmerizing duration of solar eclipses? How long do solar eclipses last? Do different types of solar eclipses last longer?

The duration of a solar eclipse varies depending on factors like the type of eclipse and the positions of the Sun, Moon, and Earth. Total solar eclipses can last from a few seconds to a maximum of approximately 7 minutes and 32 seconds under rare conditions, while partial or annular eclipses may persist for several minutes to over three hours.

Prepare to be captivated as I dive into the mysteries of these celestial events, from their duration to the captivating science and myths surrounding them.

In this article, you get to

Distinguish Eclipse Types: Learn to differentiate between partial, annular, hybrid, and total solar eclipses, driven by the positions of the Moon, Earth, and Sun.

Factors Affecting Eclipse Duration: Understand how the Moon’s distance influences eclipse duration, the Sun’s position, and the Earth’s axial inclination.

Historical and Future Eclipses: Explore the longest recorded and upcoming eclipses with estimated durations for planning viewing opportunities.

Observing Safety: Gain insights into the importance of safe eclipse observation, including the use of proper equipment and precautions to protect your eyes.

Scientific and Cultural Aspects: Discover the scientific significance of solar eclipses in fields like astronomy and atmospheric science, as well as explore the myths and superstitions surrounding these celestial events throughout history.

By the end of this article, you’ll have a comprehensive understanding of solar eclipses, from distinguishing eclipse types and exploring their durations to learning about their scientific significance, cultural myths, and the importance of safe observation practices.

Let’s dive right in.

Understanding Solar Eclipses: What is an Eclipse?

Solar Eclipse square illustration

What is a Solar Eclipse? When do Solar Eclipses Occur?

A solar eclipse is a phenomenon that occurs when:

  • The Moon aligns with the Sun and the Earth.
  • This alignment results in the obscuration of the Sun’s disk from our view.

Depending on the relative positions and distances of these celestial bodies, the Moon can:

  • Partially or entirely cover the Sun.
  • Creating different types of solar eclipses.

Solar eclipses specifically happen during a:

  • New moon phase, with the Moon positioned between the Sun and the Earth.

However, it’s essential to note that:

  • Not every new moon leads to a solar eclipse.
  • This is due to the Moon’s orbit tilt, which is about 5 degrees concerning the Earth’s orbit.

The Moon’s tilt causes:

  • Its shadow to typically miss the Earth during most new moons.
  • Resulting in no eclipse occurring.

Solar eclipses only take place during:

  • Eclipse seasons, which are about 35 days long.
  • These seasons occur twice a year when the Moon’s orbital plane intersects with that of the Earth, with one following the other.

Types of Solar Eclipses: Partial, Annular, Hybrid, and Total

solar eclipse types illustration

There are four main types of solar eclipses: partial, annular, hybrid, and total.

The type of eclipse depends on how much of the Sun’s disk is covered by the Moon during the maximum phase of the eclipse.

When do Partial Solar Eclipses occur?

partial solar eclipse occurs when the Moon covers only a part of the Sun’s disk, leaving a crescent-shaped portion of the Sun visible. Partial solar eclipses are the most common type, occurring about twice a year on average.

Annular Solar Eclipse

An annular solar eclipse occurs when the moon covers almost all but not entirely of the Sun’s disk, leaving a thin annulus of sunlight around the moon’s edge. Annular eclipses happen when the Moon is near its farthest point from the Earth (apogee), and its apparent size in the sky is smaller than that of the Sun. Annular solar eclipses are less common than partial ones, occurring about once every 18 months on average.

Increase in Annular Eclipses

There has been an increase in annular solar eclipses in recent years, partly due to the Moon’s orbital dynamics. These eclipses are often longer than total eclipses but have a different visual effect.

Source: TimeandDate

Hybrid Solar Eclipse

hybrid solar eclipse (annular-total eclipse) occurs when the type of eclipse changes from annular to total or vice versa along its path. Hybrid eclipses happen when the curvature of the Earth and the varying distances of the Moon and the Sun cause some locations to see a total eclipse and others to see an annular one. Hybrid solar eclipses are rare, occurring about once every ten years on average.

Total Solar Eclipse

A total solar eclipse is a remarkable event characterized by:

Total eclipses particularly occur when:

  • The Moon is in proximity to its closest point to Earth (perigee).
  • At this time, its apparent size in the sky surpasses that of the Sun.

It’s important to note that:

  • Total solar eclipses are the most rare and spectacular type of solar eclipse.
  • They occur approximately once every 18 months on average.

During a solar eclipse, an intriguing phenomenon takes place:

  • The gravitational pull of the Sun and the Moon align.
  • This alignment results in a stronger gravitational force that has an impact on the Earth’s oceans.

This impact manifests as:

  • Variations in tide levels, commonly referred to as eclipse tides.

Now that we’ve covered the various types of solar eclipses let’s move on to discover precisely what determines how long these celestial events last.

Factors Influencing the Duration: How Long Do Solar Eclipses Last?

solar eclipse frequency

The Role of the Moon’s Distance from the Earth

The duration of a solar eclipse primarily relies on the distance separating the Moon and the Earth at the specific time of the eclipse.

When the Moon is closer to the Earth:

  • It appears larger in the sky.
  • Consequently, it takes a longer time to traverse the Sun’s disk.

Conversely, when the Moon is farther from the Earth:

  • It appears smaller in the sky.
  • This results in a shorter duration as it crosses the Sun’s disk.

This distance between the Moon and the Earth is not constant:

  • It changes throughout the month because of the elliptical shape of the Moon’s orbit.
  • The point of the orbit closest to Earth is termed perigee, while the farthest point is known as apogee.

The distinction between these two points can be significant, reaching up to:

  • 50,000 kilometers (31,000 miles).

Effect of the Sun’s Relative Position

The duration of a solar eclipse is also influenced by the position of the Sun concerning the Earth during the eclipse.

When the Sun is closer to the Earth:

  • It appears larger in the sky.
  • Consequently, it takes more time for the Moon to cover it.

Conversely, when the Sun is farther from the Earth:

  • It appears smaller in the sky.
  • Resulting in a shorter duration as the Moon covers it.

The distance between the Sun and the Earth varies throughout the year due to the elliptical shape of the Earth’s orbit.

The point where Earth is closest to the Sun is called perihelion, while the farthest point is known as aphelion.

The difference between these two points can be substantial, reaching up to:

  • 5 million kilometers (3 million miles).

The Role of the Earth’s Axial Inclination

The duration of a solar eclipse is also influenced by the angle of the Earth’s axis concerning its orbital plane during the eclipse.

The Earth’s axis tilts approximately 23.5 degrees to its orbital plane, a phenomenon responsible for the changing seasons and day length throughout the year.

This tilt further impacts the angle at which the Moon’s shadow falls on Earth during a solar eclipse.

  • When the shadow is perpendicular to the Earth’s surface, it appears smaller and more defined, resulting in a shorter eclipse duration.
  • Conversely, when the shadow is oblique to the Earth’s surface, it appears larger and softer, leading to a longer eclipse duration.

The angle of the shadow varies based on:

  • The latitude of the eclipse location.
  • The time of the year.

Near the equator, the shadow is more perpendicular, while near the poles, it’s more oblique.

Additionally, the shadow’s orientation changes during the:

  • Equinoxes (March and September), when it is more perpendicular.
  • Solstices (June and December), when it becomes more oblique.

The Duration of a Solar Eclipse

solar eclipse length

How long does the total phase of a total solar eclipse last?

The duration of a total solar eclipse is measured by how long the totality lasts at a given location. Totality is the phase of a total solar eclipse when the Moon completely covers the Sun’s disk, and only its faint corona is visible.

Totality can last from a few seconds to over seven minutes, depending on how close the Moon and the Sun are to each other and Earth and how close you are to the center of the path of totality.

The most prolonged possible duration of totality is about 7 minutes and 32 seconds, which can only happen when both the Moon and the Sun are near their perigee and perihelion, respectively, and when aligned with one of Earth’s poles, creating a single instance of an exceptional eclipse.

This rare combination of circumstances has not occurred since July 11, 1991, when a total solar eclipse lasted 6 minutes and 53 seconds over Hawaii, Mexico, and Central America.

The Duration of Partial and Annular Eclipses

The duration of a partial or an annular solar eclipse is measured by how long it takes for the Moon to cross over any part of the Sun’s disk from one edge to another.

The eclipse duration can last from a few minutes to over three hours, depending on how much of the Sun’s disk the Moon covers and how fast they move relative to each other and Earth.

The longest possible duration of a partial or an annular solar eclipse is about 3 hours and 40 minutes, which can only happen when both the Moon and the Sun are near their apogee and aphelion, respectively, and when they align with Earth’s equator.

This rare combination of circumstances has not occurred since December 14, 1955, when an annular solar eclipse lasted for 3 hours and 28 minutes over Antarctica, Africa, Asia, and Australia.

With a grasp of the factors at play, let’s journey into the historical records and upcoming opportunities to witness solar eclipses of varying durations.

Historical and Future Solar Eclipses

Total Solar Eclipse Transition Diagram

The Longest Eclipses in Recorded History

Various civilizations have observed and recorded solar eclipses throughout history, dating back to ancient times. Some of these historical eclipses are notable for their exceptional duration or impact on human events. Here are some examples of some of the longest eclipses in recorded history:

  • The longest total solar eclipse in recorded history occurred on July 16, 2186 BC, when totality lasted for about 7 minutes and 4 seconds over North Africa, Europe, Asia, and Australia.
  • The longest annular solar eclipse in recorded history occurred on December 7, 150 BC, when annularity lasted for about 12 minutes and 24 seconds over South America, Africa, Europe, and Asia.
  • The longest hybrid solar eclipse in recorded history occurred on November 3, 2013, when the type of eclipse changed from annular to total or vice versa along its path, lasting for about 1 hour and 40 minutes over the Atlantic Ocean, Africa, and Asia.
  • The longest solar eclipse of the 21st century occurred on July 22, 2009, when a total solar eclipse lasted for about 6 minutes and 39 seconds over China, India, and the Pacific Ocean.

Tracking Eclipse Durations

Thanks to technological advancements and an understanding of celestial mechanics, astronomers and scientists continue to track and predict eclipse durations with increasing accuracy.

Source: NASA

When is the next solar eclipse? Upcoming Solar Eclipses and Their Estimated Durations

Solar eclipses are predictable events that follow a regular pattern known as the Saros cycle.

The Saros cycle is about 18 years and 11 days, during which a series of eclipses with similar characteristics occur.

Each Saros cycle consists of about 70 to 80 eclipses containing smaller groups called Saros series. Each Saros series consists of about 12 to 15 eclipses, which occur at intervals of about 18 years and 11 days.

Each eclipse in a Saros series shifts slightly in time and location from the previous one until the series ends after about 1,300 years.

Using the Saros cycle and other methods, astronomers can accurately calculate the dates and locations of future solar eclipses.

Here are some examples of some of the upcoming solar eclipses and their estimated durations:

  • The next annular solar eclipse will occur on October 14, 2023, when annularity will last for about 5 minutes and 17 seconds over Central America, South America, and the Pacific Ocean.
  • The next longest total solar eclipse will occur on August 12, 2026, when totality will last 6 minutes and 5 seconds over Greenland, Iceland, Spain, and Morocco.

Experiencing a Solar Eclipse: What to Expect

people enjoying the corona during a total solar eclipse

The Phenomena Associated with Total Solar Eclipses

Total solar eclipses are rare and remarkable events that produce various phenomena that can be observed by the naked eye or with simple instruments.

Some of these phenomena are:

  • The diamond ring effect is a brief flash of light that appears just before or after totality when a bright spot of sunlight remains visible along the edge of the Moon’s disk. The area resembles a diamond star on a light ring formed by the Sun’s corona.
  • The Baily’s Beads effect is a series of bright spots that appear along the edge of the Moon’s disk just before or after the diamond ring effect when sunlight shines through the valleys and craters on the Moon’s surface. The spots resemble beads on a string that change in number and shape as the Moon moves across the Sun’s disk.
  • The corona is the Sun’s outer atmosphere that becomes visible during totality as a faint halo of light around the Moon’s disk. The corona has a complex structure that varies with the Sun’s activity cycle. It can extend for several million kilometers from the Sun’s surface and has a temperature of over one million degrees Celsius.
  • The chromosphere is a thin gas layer between the Sun’s surface and the corona. It becomes visible during the beginning or the end of totality as a reddish-pink glow around the edge of the Moon’s disk. The chromosphere is where most of the Sun’s flares and prominences occur, which are plasma eruptions that can reach hundreds of thousands of kilometers.
  • The shadow bands are faint ripples of light and dark that appear on the ground or light-colored surfaces a few minutes before or after totality. They are caused by the Earth’s atmosphere refracting the sunlight that passes through the edge of the Moon’s shadow. The shadow bands move rapidly and randomly, and their appearance depends on the weather conditions and the observer’s location.

As we continue, let’s shift our focus to an essential aspect: ensuring your safety during solar eclipse observation so you can fully appreciate these awe-inspiring phenomena.

Ensuring Safety While Observing Solar Eclipses

Solar Eclipse Viewing photo credit North Charleston Flickr
Solar Eclipse Viewing photo credit North Charleston, Flickr

While solar eclipses are fascinating events that anyone can enjoy, they also pose a severe risk to the eyesight of those who observe them without proper protection. Even briefly, looking directly at the Sun can cause permanent damage to the retina, which is the light-sensitive layer of cells at the back of the eye.

This damage can result in blindness or reduced vision. It may not be noticeable until hours or days after the exposure.

It is essential to follow some safety guidelines while observing solar eclipses:

  • Never look at the Sun directly with the naked eye or with any optical device, such as a camera, a telescope, or a binocular, unless they have a special solar filter that blocks most of the Sun’s light and heat. Ordinary sunglasses, smoked glass, or darkened film are not enough to protect the eyes from the Sun’s harmful rays.
  • Only look at the Sun directly during the brief phase of totality, when the Moon completely covers the Sun’s disk, and only its corona is visible. When the first glimpse of sunlight appears along the edge of the Moon’s disk, look away immediately and use a solar filter or another safe method to observe the rest of the eclipse.
  • Use a projection method, such as a pinhole camera, a cardboard box, or a mirror, to watch the eclipse indirectly. These methods create an image of the Sun on a screen or a wall, which multiple people can safely view simultaneously.
  • Watch the eclipse online or on television, where it will be broadcast live by various media outlets and organizations. TV or online is a convenient and safe way to enjoy the eclipse from anywhere in the world.

Solar Eclipse Safety Awareness

With increasing interest in eclipses, there is a growing emphasis on eclipse safety. Educating the public about the dangers of looking at the Sun during an eclipse without proper eye protection is an ongoing trend.

Source: NASA

Our exploration now takes us into the scientific significance of solar eclipses and their contribution to astronomy and atmospheric science.

The Science Behind Solar Eclipses

How Solar Eclipses Contribute to Astronomical and Atmospheric Studies

Solar eclipses are spectacular events attracting millions of viewers and valuable scientific research and discovery opportunities.

Solar eclipses have contributed to various fields of astronomy and atmospheric science over the years, such as:

  • The confirmation of Einstein’s theory of general relativity: 1919 British astronomer Arthur Eddington observed a total solar eclipse in Brazil and measured how much the Sun’s gravity bent the light from distant stars that passed near its edge. His results agreed with Einstein’s prediction that gravity can warp space and time, thus confirming his revolutionary theory.
  • The discovery of helium: In 1868, French astronomer Jules Janssen observed a total solar eclipse in India and detected a new spectral line in the Sun’s chromosphere that did not match any known element on Earth. He named it helium, after the Greek word for the Sun (Helios). Later, scientists found helium is the second most abundant element in the universe and the first outside Earth.
  • The study of the Sun’s corona and its influence on the Earth’s magnetosphere: During a total solar eclipse, the corona becomes visible and can be studied using various instruments. The corona is the source of the solar wind, a stream of charged particles that flows from the Sun and interacts with the Earth’s magnetic field. The solar wind can cause phenomena such as auroras, geomagnetic storms, and space weather, affecting communication systems, power grids, and satellites.
  • The measurement of the Earth’s atmosphere and its response to the eclipse: During a solar eclipse, the airdrop’s temperature and pressure rapidly as the Moon’s shadow passes over a region. Scientists measure how the atmosphere changes in response to the sudden loss of sunlight. The eclipse also affects the behavior of animals and plants that rely on daylight cues for their activities.

Scientific Studies During Eclipses

Solar eclipses offer unique opportunities for scientific research. Astronomers use eclipses to study the Sun’s corona, the Earth’s ionosphere, and other celestial phenomena. This trend continues to advance our understanding of the cosmos.

Source: National Geographic

In our final stretch, we’ll uncover the rich tapestry of myths and superstitions associated with solar eclipses, revealing the cultural beliefs woven around these celestial events.

Myths and Superstitions Regarding Solar Eclipses

Myths and superstitions have surrounded solar eclipses since ancient times when people did not understand their nature and origin. Some cultures regarded them as signs of divine wrath, omens of doom, or portents of change. Some examples of these beliefs are:

  • The people of ancient China believed that a dragon or a dog swallowed the Sun, causing a solar eclipse. They would bang drums and pots to scare away the beast and restore the Sun.
  • In ancient Greece, people believed that a solar eclipse manifested the anger of Zeus, the king of the gods. They would perform rituals and sacrifices to appease him and restore order.
  • In ancient India, people believed that a demon named Rahu or Ketu caused a solar eclipse by chasing and devouring the Sun. They would fast and pray to protect themselves from the evil influence of the demon and purify themselves after the eclipse.
  • In some Native American tribes, such as the Navajo and the Pomo, people believed that a solar eclipse was a time of transformation and renewal when the Sun died and was reborn. They would refrain from looking at the eclipse and perform ceremonies to honor the Sun and its power.

Let’s now address common questions about lunar eclipses, offering you a comprehensive understanding of both solar and lunar phenomena.

How long do lunar eclipses last?

Lunar eclipses can vary in duration, but on average, a lunar eclipse lasts about 4 to 7 hours from the beginning of the partial phase to the end of the penumbral phase. When the Earth’s shadow completely covers the Moon, the totality phase typically lasts around 20 to 30 minutes.

What causes the moon to shine?

The Moon doesn’t shine on its own; it reflects the sunlight that falls on its surface. The reflected sunlight makes the Moon appear bright in our night sky, creating the effect we perceive as moonlight.

What is a lunar eclipse?

A lunar eclipse occurs when the Earth passes between the Sun and the Moon, causing the Earth’s shadow on the Moon’s surface. This shadow gradually covers the Moon, leading to a temporary darkening or reddening of the Moon, depending on the type of lunar eclipse.

How long can a lunar eclipse last?

The total duration of a lunar eclipse can vary, but it typically lasts for several hours. The total phase, during which the Moon is entirely within Earth’s shadow, usually ranges from 20 to 30 minutes. The entire eclipse, from the beginning of the partial phase to the end of the penumbral phase, can last 4 to 7 hours.

When is the next lunar eclipse?

The timing of lunar eclipses varies, but they occur relatively frequently. You can consult an astronomical calendar or use an astronomy app to determine when the next lunar eclipse will happen in your location. Lunar eclipses are observable from different parts of the world, and their dates and visibility depend on your geographic location.

Summary: How long does a Solar Eclipse last

Thank you for reading my article “How long do Solar Eclipses last?”

Solar eclipses are rare and beautiful events that have fascinated humanity for millennia. They are also valuable opportunities for scientific exploration and discovery, as they reveal aspects of the Sun, the Moon, and the Earth that are otherwise hidden or inaccessible. Solar eclipses are reminders of the intricate and dynamic relationship between these three celestial bodies and the cosmos’ wonder and mystery.

If you ever can witness a solar eclipse, do not miss it. This unforgettable experience will leave you in awe and admiration of nature’s grandeur. However, observe it safely and responsibly, using proper equipment and following safety guidelines. And remember, solar eclipses are transient phenomena that last only a few minutes or seconds, so enjoy them while they last.

Leave a Comment

About the Author

Chris Klein, Amateur Astronomy Advisor

Chris Klein is an amateur astronomy advisor, astrophotographer, and entrepreneur. Go here to read his incredible story "From $50,000 in Debt to Award-Winning Photographer Living in Switzerland". If you want to send Chris a quick message, then visit his contact page here.

Read Next in Solar Eclipse Basics

Latest Articles