Earth & Moon
Articles about our home - and our close companion, object of awe, subject of poetry and the only other world on which humans have walked.
Absolute Beginners - Moonwatching
We take the Moon for granted, because itīs so close to us and easy to see. But itīs a beautiful and interesting object as it goes through its monthly changes. If you use a pair of binoculars, you can learn to recognize many of its main features. Some of them are visible without binoculars too.
Aurorae - Polar Light Shows
Thereīs a glow on the northern horizon. The Sun set hours ago and there are no city lights there. Whatīs up? You could be seeing natureīs great polar light show an aurora. With solar activity on the rise, you might not have to go to the far north (or south) to see one.
Autumn begins on the equinox as the Sun crosses the equator. Equinoxes were celebrated by the earliest known civilizations and still are in many places. One of the biggest celebrations these days is the Chinese Moon Festival. A traditional palace or garden probably has a moon-watching pavilion.
Carrying the Fire - book review
What was it like to be one-third of the Apollo 11 crew? Michael Collins, the man in the command module that didnīt land on the Moon, tells a fascinating story of astronaut training and space travel. Originally published in 1974, a Fortieth Anniversary edition of Carrying the Fire was issued.
Christmas in the Skies
Christmas is a special day with a magic of its own. A Christmas eclipse is a great treat and centuries ago a long-awaited comet finally showed up on Christmas day. On the other hand, imagine spending the holidays a quarter of a million miles from home as the crew of Apollo 8 did.
We no longer see the heavens as perfect and the stars as eternal and unchanging. Even the Universe had a beginning, and everything that we observe changes and evolves. Many of these changes involve cosmic collisions.
Ecliptic and Equinoxes
The objects in the night sky seem to be projected onto the celestial sphere. A coordinate system lets us say where everything is, but something's not quite right. The north polar star will be Vega one day. Astrological star signs don't match the constellations any more. What's going on?
Exploring the Apollo Landing Sites
NASA sent the Lunar Reconnaisance Orbiter (LRO) to the Moon to spy out sites for future manned missions. It doesnīt look like theyīll be sending anybody to the Moon, but LRO has documented the Apollo landing sites. Astronomy writer and space expert Ian Ridpath takes us to the Moon for a look.
In the Shadow of the Moon Review
What would it be like to leave Earthīs protective embrace and journey to an alien world? Only twenty-four men have ever experienced this - Apollo astronauts. "In the Shadow of the Moon" uses original footage & astronaut interviews to tell the story of one of the defining events of human history.
Itīs Alive - book review
Bang Theory in verse and drawings. Now stars and planets have formed, but something new is happening: Life. Book 2 is about evolution by natural selection. In its cheerful verse and lovely color drawings, itīs also a love poem to our beautiful Earth.
Imagine the horror: Something is eating the Moon, leaving its face covered in blood. This was how people once viewed lunar eclipses. Find out what actually causes a lunar eclipse, why the Moon may turn red during an eclipse, and where a lunar eclipse becomes a solar eclipse.
Moon Facts for Kids
The Moon has no air, no sound, no weather and no liquid water. But you could see the Earth in the sky, shining more brightly than the Moon does from Earth. And since gravity is weaker, you could jump quite high and the footprint you left might last a million years.
Once in a Blue Moon
Once in a blue moon is a common English expression and it refers to a rare event. But why a blue Moon? And what is a blue Moon if it isn't blue? There is no unique answer, but here are a few things it could be.
Is it an ill omen, an amazing or terrifying experience, or a great opportunity for scientists? Solar eclipses have been all of these things and more. Read on to find out what it's all about.
Teaching Moon Phases and Eclipses
Why does the Moon seem to change shape? If eclipses happen when the Sun, Moon and Earth are all lined up, why don't they happen every month? If you're an educator, you may need to understand why and explain it to children. Here are some online resources to help you out.
The Moon - Earth's Daughter
The Moon preserves the history of the early Solar System that weathering has swept from Earth's surface. It lights up our nights and is the ancient timekeeper of human prehistory. A massive collision may have created the Moon from the body of the Earth.
The Sun the Moon the Calendar
If you look at your calendar to find today's date, you can see the month, days of the week and maybe some appointments. But you're also looking at something that tracks Earth's journey around the Sun, reflects three thousand years of history and helps hold our society together.
Top Astronomy Stories 2012
What were the big astronomy stories of the year 2012? Here is my choice of the top ten plus a non-story. What do you think?
What Is a Supermoon
Some times the media are full of stories about a supermoon. They may even include dire predictions of earthquakes, tsunamis and other disasters. What is a supermoon and should you be worried?
Why planets have seasons
For people living outside the tropics, June 21st is the longest or shortest day of the year, a solstice. It marks the first day of summer in the northern hemisphere and winter in the southern hemisphere. But why do we have seasons? And do other planets have them?
Winter Solstice Astronomy Homepage | Editor's Picks Articles | Top Ten Articles | Astronomy Site Map
For six months, each day has been shorter than the last, the Sun lower in the sky. Will it disappear altogether and leave the people bereft in the dark cold winter? The winter solstice is the shortest day of the year and is associated with more festivals than any other astronomical event.
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