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
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
Which way do the clocks go? "Spring forward or fall back" is just one way to remember which way set the clocks for Daylight Saving Time (DST). more
The December solstice is also known as the summer solstice in the Southern Hemisphere and the winter solstice in the Northern Hemisphere. more
The fall (autumnal) equinox in the Northern Hemisphere is in September. In the Southern Hemisphere it's in March. more
The June solstice is the longest day of the year in the Northern Hemisphere & the shortest day in the Southern Hemisphere. more
The Vernal (Spring) Equinox in the Northern Hemisphere is in March. In the Southern Hemisphere it's in September. more
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
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
A total lunar eclipse occurs when the Earth's shadow blocks all the Sun's light from directly reaching the Moon's surface. more
Everything you need to know about total eclipses of the Sun. more
Tips and tricks for taking breathtaking photographs of the sunsets and sunrises. more
Solar and lunar eclipses, why they occur, when the next eclipse is, and from where you can see them. more
The Winter solstice in the Northern Hemisphere is in December, while in the Southern Hemisphere it's in June. more
The Summer Solstice in the Northern Hemisphere is in June, while in the Southern Hemisphere it's in December. more
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
An annular solar eclipse occurs when the Moon moves in front of the Sun but does not cover the it completely. more
A partial solar eclipse is more common than a total solar eclipse, and happens when the Moon only partially covers the Sun. more
Aurora borealis or northern lights and aurora australis or southern lights are natural electric phenomena that creates bright and colorful light displays in the skies. Auroral light displays are common within the Arctic and the Antarctic Circles. more
Find out what you can do to protect your eyes during a solar eclipse. more
A penumbral lunar eclipse occurs when the outer shadow of the Earth falls on the Moon's face. It is easy to miss this type of lunar eclipse. more
A partial lunar eclipse happens when the Earth moves between the Sun and the Moon, but they are not precisely aligned. more
Learn more about atmospheric phenomena that are created by the reflection and refraction of light by ice crystals in the atmosphere. more
In many Northern Hemisphere cultures, the June solstice is associated with holidays, feasts and celebrations. more
Instructions on how to make a pinhole projector using household items to safely see a solar eclipse. more
The 2012 Venus transit will be the last chance to view this phenomenon for over 100 years more
What do astronomers really mean when they use those technical terms? more
10 things you may not know about the December Solstice. more
10 things you may not know about the March Equinox. more
The March 20, 2015 Total Solar Eclipse will be a grand and rare sight. Here are 10 facts not to be missed. more
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
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
Solar eclipses happen when the Moon moves between Sun and Earth, blocking the Sun's rays and casting a shadow on Earth. more
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
A lunar eclipse can be viewed with the unaided eye unlike solar eclipses, which have special safety requirements. Viewing tips. more
Find out why a totally eclipsed Moon turns a shade of red. more
Learn more about different kinds of twilight, dawn and dusk. more
Earthshine refers to the phenomenon when light from the Earth illuminates the Moon. Find out when you can see it. more
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
11 things you may not know about the June Solstice. more
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
Seasons are caused by the Earth's rotation around its axis. more
Sky watchers have wonderful sights still to come in 2015. Meteor Showers will peak, a Partial Solar Eclipse and the last Blood Moon in a tetrad awaits. more
An Analemma is a graph or plot that shows the position of the sun in the sky at a single location and at the same time of the day throughout a year as measured by a sundial. more
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