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What Are Solar Eclipses?

Solar eclipses are a spectacular sight and a rare astronomical event. Each one is only visible from a limited area.

Illustration image

The darkest phases of solar eclipses.

Solar eclipses can have a maximum point which is either partial, annular, or total. Some times, there are hybrid eclipses where there is both an annular and a total maximum point but in different locations.


The Moon Eclipses the Sun

Solar eclipses happen when the New Moon moves between the Sun and Earth, blocking out the Sun's rays and casting a shadow on parts of Earth.

The Moon's shadow is not big enough to engulf the entire planet, so the shadow is always limited to a certain area (see map illustrations below). This area changes during the course eclipse because the Moon and Earth are in constant motion: Earth continuously rotates around its axis while it orbits the Sun, and the Moon orbits Earth. This is why solar eclipses seem to travel from one place to another

Types of Solar Eclipses

There are 4 different types of solar eclipses. How much of the Sun's disk is eclipsed–the eclipses magnitude depends on which part of the Moon's shadow falls on Earth.

  • Total solar eclipses happen when the Moon completely covers the Sun, and it can only take place when the Moon is near perigee, the point of the Moon's orbit closest to Earth. You can only see a total solar eclipse if you're in the path where the Moon's casts its darkest shadow, the umbra.
  • Partial solar eclipses occur when the Moon only partly eclipses the Sun's disk and casts only its penumbra on Earth.
  • Annular solar eclipses take place when the Moon's disk only covers the center of the Sun's disk, leaving the Sun's outer edges visible to form a ring of fire in the sky. An annular eclipse of the Sun takes place when the Moon is near apogee, and the Moon's antumbra falls on Earth.
  • Hybrid solar eclipses happen when the same eclipse has an annular maximum point in some locations and a total maximum point in other locations. These are very rare.

Solar Eclipses Mainly Look Partial

Solar eclipses are only visible from within the area on Earth where the Moon's shadow falls, and the closer you are to the center of the shadow's path, the bigger the eclipse looks. The maximum point is only visible at the very center of the shadow, and only here will you see the darkest stage of solar eclipses.

Solar eclipses are usually named for their darkest, or maximum, point, even if it sometimes lasts less than a second. The exception is the very rare hybrid solar eclipse when an annular eclipse turns into a total solar eclipse along the eclipse's path.

The maximum point of solar eclipses is only visible from a small area. In most places and for most of the duration, total, annular, and hybrid eclipses look like a partial solar eclipse.

Only around New Moon

For a solar eclipse to take place, the Sun, the Moon, and Earth must be aligned in a perfect or near perfect straight line–an alignment astronomers call syzygy. This happens around New Moon every lunar month.

So, why isn't there a solar eclipse every New Moon night?

There are 2 reasons:

  1. The New Moon has to be near a lunar node. These nodes are 2 points where the plane of the Moon's orbital path around Earth meets Earth's orbital plane around the Sun–the ecliptic. The paths meet because the plane of the Moon's path around Earth is inclined at an angle of approximately 5° to the ecliptic.
  2. The Sun must also be close to a lunar node so it can form a perfect or near-perfect line with the Moon and Earth. This alignment occurs a little less than 6 months apart, and it lasts, on average, around 34.5 days. It is only during this time–the eclipse season–that eclipses can take place.

When there is a Full Moon during the eclipse season, we see a lunar eclipse.

Protect Your Eyes!

Never look directly at the Sun, eclipsed or otherwise, without any protective eyewear. The Sun’s UV radiation can burn the retinas in your eyes leading to permanent damage or even blindness.

The best way to safely watch a total solar eclipse is to wear protective eclipse glasses or to project an image of the eclipsed Sun using a pinhole projector.


Next Total Solar Eclipse


Total Solar Eclipse

Aug 21, 2017 at 15:46 UTCSee more


Eclipse Lookup

Solar Eclipses

  1. Different Types of Eclipses
  2. What are Solar Eclipses?
  3. Total Solar Eclipses
  4. Partial Solar Eclipses
  5. Annular Solar Eclipses
  6. Solar Eclipses in History
  7. Solar Eclipse Myths and Superstitions
  8. Magnitude of Eclipses


Eclipse Shadows

  1. Umbra
  2. Penumbra
  3. Antumbra

Why Are There 3 Shadows?

Protect Your Eyes

  1. Never Look Directly at the Sun
  2. Simple Pinhole Projector
  3. Eclipse Projector in a Box
  4. Binoculars / Telescope Projector

Eclipses & Transits

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