What is a Partial Solar Eclipse?
Next Eclipse: Annular Solar Eclipse – Thu, Sep 1, 2016 … See animation
Next Partial Solar Eclipse: Thu, Feb 15, 2018 … See animation
Partial Solar Eclipses happen when the Moon comes between the Sun and the Earth, but they don't align in a perfectly straight line. Because of this, the Moon only partially covers the Sun's disc.
The Sun looks like the Moon has taken a bite out of it. This is because the Moon casts the lighter, outer part of its shadow, the penumbra, on Earth.
Why Total Eclipse, it's Only Partial?
Eclipses are named after their max point. If an eclipse is total from any part on Earth, it will be called a total eclipse, even though it might be seen as a partial eclipse from most areas.
Upcoming 5 Partial Solar Eclipses
|Dates||Path of the eclipse|
|Feb 15, 2018|
|Jul 13, 2018|
|Aug 11, 2018|
|Jan 5 / Jan 6, 2019|
|Apr 30, 2022|
Unlike total and annular solar eclipses, the Moon does not have to be at its perigee or apogee for a partial solar eclipse to take place.
Only at New Moon
However, a new Moon is necessary for a partial solar eclipse to occur, but partial solar eclipses do not happen during every new Moon night.
This is because the plane of the Moon's orbital path around the Earth is inclined at an angle of 5° to the Earth's orbital plane (ecliptic) around the Sun. The points where the 2 orbital planes meet are called lunar nodes. Solar eclipses occur only when a new Moon takes place near a lunar node.
During a partial solar eclipse, the Moon's umbra completely misses the Earth. Everyone in the Moon's penumbra gets to see a partially eclipsed Sun. There are 3 distinct stages of a partial solar eclipse:
- Partial solar eclipse begins: The Moon starts moving over the Sun's disc.
- Maximum eclipse: The Moon partially covers the Sun. If you're somewhere in the eclipse's path, you'll see that the Moon appears to take a bite out of the Sun.
- Partial solar eclipse ends: The Moon stops covering the Sun.
Where Can I see a Partial Solar Eclipse?
Partial solar eclipses occur more often and are usually seen more often than total or annular solar eclipses.
About 35% of all solar eclipses are partial solar eclipses. This is because the Moon's distance from Earth is irrelevant for partial solar eclipses. The larger size of the Moon's penumbra compared to its umbra also means that more places on Earth get to experience a partial solar 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 the eyes leading to permanent damage or even blindness.
The only 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 Partial Solar Eclipse begins in
Feb 15, 2018 at 6:55 PM UTC … See more
- Different Types of Eclipses
- What are Solar Eclipses?
- Total Solar Eclipses
- Partial Solar Eclipses
- Annular Solar Eclipses
- Solar Eclipses in History
- Solar Eclipse Myths and Superstitions
- Magnitude of Eclipses
Watch daylight move across the planet... More