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Articles about Earth (35)

September Equinox

The Sun shines directly at the equator on the September equinox and the length of day and night is nearly equal, but not quite. more

December Solstice

The December solstice is also known as the summer solstice in the Southern Hemisphere and the winter solstice in the Northern Hemisphere. more

When is Fall Equinox?

The fall (autumnal) equinox in the Northern Hemisphere is in September. In the Southern Hemisphere it's in March. more

When is Spring Equinox?

The Vernal (Spring) Equinox in the Northern Hemisphere is in March. In the Southern Hemisphere it's in September. more

About Moon phases

There are 4 primary phases of the Moon - new, first quarter, full and third quarter, and 4 intermediate phases - waxing crescent and gibbous, and waning gibbous and crescent. more

March Equinox

The March equinox around March 20-21 is the spring (vernal) equinox in the northern hemisphere and fall (autumnal) in the south. Night and day are nearly the same length. more

Solar Eclipses in History

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

Annular Solar Eclipse

An annular solar eclipse occurs when the Moon moves in front of the Sun but does not cover the it completely. more

Partial Solar Eclipse

A partial solar eclipse is more common than a total solar eclipse, and happens when the Moon only partially covers the Sun. more

What's a Blood Moon?

Blood Moon is sometimes used to describe a Total Lunar Eclipse. When the Earth casts its shadow on a Full Moon and eclipses it, the Moon may get a red glow. more

10 Facts: Total Lunar Eclipse

The April 4, 2015 Total Lunar Eclipse is the third eclipse in a series of four Total Eclipses of the Moon called Eclipses of the Blood Moon. 10 facts about the eclipse. more

What's 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

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

How to See Lunar Eclipses?

A lunar eclipse can be viewed with the unaided eye unlike solar eclipses, which have special safety requirements. Viewing tips. more

What is Earthshine?

Earthshine refers to the phenomenon when light from the Earth illuminates the Moon. Find out when you can see it. more

Equation of time

Why doesn't the year's earliest sunset not occur on the Winter Solstice, even though it is the shortest day of the year in terms of daylight? more

Midnight Sun

Midnight Sun, or Polar Day, means that at least a sliver of the Sun's disk is visible above the horizon 24 hours of the day. more

Earth's orbit & solstice

The Earth's closest approach to the Sun 2 weeks after the December solstice is a coincidence and has no special significance. more

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