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When Does Winter Begin?
Winter Solstice 2019: The...
Winter officially begins with the Winter Solstice on
December 21, 2019
. This is the astronomical first day of winter in the...
FREE BEGINNER'S GARDEN GUIDE!
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The Full Moon: November
Each month, we will explain the traditional names of the full Moon along with some fascinating Moon...
Weather by the Moon
See the below Weather by the Moon calendar showing what sort of weather will probably follow the...
Giant Jupiter Pays a Visit
In the latter half of 2010 Jupiter will be making it’s brightest, closest appearance in over 45...
What on Earth is Epact?
Here’s a little something deliciously arcane for those who long for the “simplicity” of life before...
Astronomy Resources: Star Maps, Sky Views, Telescopes
Whether you're a beginner sky watcher or a serious astronomer, here are astronomy resources that...
What is Earth’s magnetosphere? Watch NASA scientist David Sibeck as he explains the workings of the...
Top 5 Sun Discoveries #4: Seasons of the Sun
Learn about the discovery of the eleven-year solar cycle, and it’s importance in predicting the...
Top 5 Sun Discoveries #1: Unlocking the Secrets of Space Weather
Watch this video to learn about space weather—the environmental conditions outside of Earth’s...
Top 5 Sun Discoveries #2: The Heliosphere
When the Voyager II spacecraft crossed the heliosphere, NASA got a new perspective when a picture...
Top 5 Sun Discoveries #5: The Dynamic Sun
This video contains a short history of the observation of the sun, from Galileo’s telescope to...
The Hubble Telescope
The Hubble Telescope has been photographing our universe in great detail since it’s launch in 1990...
Perigee and Apogee
Ever heard the terms perigee and apogee? Here is a quick definition. The Moon's orbit periodically...
Earth experiences proxigean tides—an extraordinary tidal range that, when combined with other...
Change of Season Celebrations
For centuries, people have watched the sky for the changes of season and then celebrated with...
The Eight Layers of the Sun
The Sun is Hotter Than Hot! The Sun's temperature varies over time and throughout these seven...
The Gravitational Pull of the Sun
The Sun Has a Lot of Pull! The Sun makes up more than 99 percent of the total mass of the solar...
How Much Energy Does the Sun Produce?
The Sun Is a Huge Ball of Energy The Sun is about 865,000 miles in diameter. That's as wide as...
What is the Sun Made of?
What's the Sun made of? It's not solid. The Sun is composed of plasma, a material made from...
How Old is the Sun?
The Sun is one of 100 billion stars in our Milky Way galaxy. Scientists estimate that the Sun is...
Farming by the Moon
The age-old practice of performing farm chores by the Moon stems from the simple belief that the...
Moon Lore: Weather
Farmers, sailors, and other sky watchers have long used the Moon to predict the weather. The next...
Moon Lore: Dreams
There are many dreams and superstitions about the Moon. Here are a handful to contemplate: To...
Moon and the Gods
The Moon is rich in history and folklore, and to many sky watchers, the Moon is home to the gods....
Ever seen a Moon dog? When the Moon is low in the sky, a bright “false Moon” (a well-defined saucer...
The Moon's Healing Powers
Not all of the Moon's effects on health are considered negative. Some suspect that the flow of...