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Articles about Sun (53)

Daylight Saving Time – DST

Daylight Saving Time aka Daylight Savings Time, DST or Summer Time. Clocks go forward 1 hour in the spring and back in the fall to make better use of natural daylight. more

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

One Hour Forward or Back?

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

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

What is June Solstice?

The June solstice is the longest day of the year in the Northern Hemisphere & the shortest day in the Southern Hemisphere. 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 it completely. more

Partial Solar Eclipse

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

Make a Pinhole Projector

DIY: Make a simple pinhole projector using two pieces of card or paper to safely watch a projection of a solar eclipse. 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

What is Local Mean Time (LMT)?

Use a sundial to determine the time of day and you will probably be off by a few minutes. That's where LMT comes into play. How is it measured and what is it used for? more

What's a Blood Moon?

Blood Moon is sometimes used to describe 4 total lunar eclipses in a row. When the Earth casts its shadow on a full Moon and eclipses it, the Moon may get a red glow. more

11 Facts: Total Lunar Eclipse

The Sept 27/ 28, 2015 Total Lunar Eclipse is the final eclipse in a series of 4 total eclipses of the Moon called eclipses of the Blood Moon. more

Eclipse Magnitude

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

Mercury Transit

Local time for Mercury transit May 9 / May 10, 2016. Visible from most of the world. Will you be able to see it? Map of path and animation. 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

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 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

What are Polar Nights?

A Polar Night is a night that lasts for at least 24 hours. It's the opposite of Midnight Sun / Polar Day. more

Solar analemma

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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