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Articles About Eclipses (32)

What Is a Solar Eclipse?

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

Annular Solar Eclipse

An annular solar eclipse is when the Moon moves in front of the Sun but leaves the outer edge of the Sun visible as a ring of fire. more

What Is the Antumbra?

The antumbra is the lighter part of a shadow that forms at a certain distance from the object casting the shadow. It is involved in annular solar eclipses and planet transits. more

What's a Blood Moon?

Blood Moon may stem from the red glow a Full Moon gets when Earth casts a shadow on it. The term is sometimes used to describe 4 total lunar eclipses that occur in a row. more

What Is a Hybrid Eclipse?

A hybrid eclipse or annular/total eclipse starts as a total solar eclipse but changes into an annular solar eclipse. Why is that so? When is the next hybrid solar eclipse? more

Eclipse Magnitude

Eclipse magnitude is a number that astronomers associate with solar or lunar eclipses. What does it mean? more

DIY: Pinhole Projector

Make a simple pinhole projector using 2 pieces of card or paper to safely watch a projection of a solar eclipse. more

Mercury Transit

Local time for Mercury transit November 11/12, 2019. Visible from most of the world. Will you be able to see it? Map of path and animation. more

What Is the Penumbra?

The penumbra is the lighter outer part of a shadow. The Moon's penumbra causes partial solar eclipses, and the Earth's penumbra is involved in penumbral lunar eclipses. more

Penumbral Lunar Eclipse

A penumbral lunar eclipse occurs when the outer shadow of Earth falls on the Moon's face. It is easy to miss this type of lunar eclipse. more

Why 3 Shadows?

The Earth and the Moon cast 3 different shadows: umbra, penumbra, and antumbra. Why are there 3 types of shadows and how are they defined? more

Solar Eclipses in History

Solar eclipses were historically see, as omens that bring about death and destruction. People in many ancient civilizations tried their best to understand them. more

Solar Eclipse Myths

The solar eclipse has inspired many mythical stories and influenced human behavior. Even today, eclipses of the Sun are considered bad omens in many cultures. more

Total Lunar Eclipses

A Total Lunar Eclipse happens when Earth's shadow blocks the direct light from the Sun reaching the Full Moon. more

Total Solar Eclipses

The total solar eclipse on August 21, 2017, has been nicknamed the Great American Eclipse as it will be visible all across the United States. more

What Is the Umbra?

The umbra is the dark center portion of a shadow. The Moon's umbra causes total solar eclipses, and the Earth's umbra is involved in total and partial lunar eclipses. more

Watching Lunar Eclipses

A lunar eclipse can be seen with the naked eye, unlike solar eclipses, which have special safety requirements. more

2017 / 2018 Cosmic Calendar

List of cosmic events in 2017 an 2018 including supermoons, solar and lunar eclipses, meteor showers, solstices, and equinoxes. more

June 5-6, 2012: Transit of Venus

The 2012 Venus transit was the last chance to see this phenomenon for over 100 years. Mercury transits happen more often, the next one in May 2016. more

The Full Moon

The Full Moon is the moment the entire face of the Moon is illuminated by the Sun's rays. It is the 3rd primary phase. Each Full Moon has a name, except the Blue Moon. more

The New Moon

In modern astronomy, the New Moon is when the Sun and Moon are aligned, with the Sun and Earth on opposite sides of the Moon. The New Moon also has important cultural and religious significance worldwide. more

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