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Articles About Sun (59)

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

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

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

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 11. / 12. November, 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

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 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

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

Solar Eclipse Photography

It takes some skill and some extra equipment to take dramatic pictures of a solar eclipse. But it is possible to capture the mood even with a simple cell phone camera. 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

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

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

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

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

When Is Spring Equinox?

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

December Solstice Facts

10 things you may not know about the December Solstice, the shortest day of the year in the Northern Hemisphere. more

Magnetic Declination

A compass needle doesn't point to the geographical North Pole but to magnetic north. Did you know that it usually doesn't point to the magnetic North Pole either? more

Dawn – Definition and Meaning

Dawn generally refers to the transition from night to day as the morning twilight brightens the sky. However, there is also a formal definition that refers to specific moments during that transition. more

Dusk – Definition and Meaning

Dusk generally refers to the transition from sunset to nighttime, and the term is often used as another word for evening twilight. However, science defines dusk on the basis of the angle that the Sun makes with the horizon. more

What is Earthshine?

Earthshine is a dull glow that occurs when the Sun’s light reflects off the Earth's surface and illuminates the unlit portion of the Moon. 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

Equinox: Equal Day & Night?

Equinoxes don't have exactly 12 hours of day and night all over the world, like many believe. Such days do happen, but depend on the latitude of your city. 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

Earth's closest approach to the Sun is 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

What Causes Seasons?

Seasons change because Earth's rotational axis tilts away or towards the Sun during the course of a year. more

2017 Cosmic Calendar

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

Solar analemma

A Solar Analemma is a graph showing the position of the Sun in the sky above a single location at the same time of the day throughout the course of a year. 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

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