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Summer Solstice 2019: First Day of Summer
The timing of the June solstice—or, summer solstice in the Northern Hemisphere—varies between June...
Spring Equinox 2019: The First Day of Spring
The spring equinox (also called the March equinox or vernal equinox) falls on Wednesday, March 20,...
Space Weather: Sunspots, Solar Flares & Coronal Mass Ejections
Here at the Almanac, we have long believed that solar activity can influence weather patterns here...
The Influence of Solar Activity on Weather
What is the influence of solar activity on the weather? Dr. Richard Head, a former weather...
How to Safely Watch a Total Solar Eclipse
You can seriously damage your eyes by watching a solar eclipse without proper protection (NOT...
Next Total Solar Eclipse
When is the next total solar eclipse? See our dates when the total eclipse of the Sun is visible...
What are Perihelion and Aphelion?
Earth reaches its annual far point from the Sun, aphelion, on Friday, July 6, 2018. Find a brief...
What Are Sunspots?
The Old Farmer’s Almanac uses sunspot activity to help in making its weather predictions. What are...
Groundhog Day and Shadow Fun
Groundhog Day. Just a bizarre tradition involving rodents? Or, rather, marmots? Actually, Groundhog...
Solar Eclipse Safety: How to Protect Your Eyes
The great solar eclipse is now just days away. I hope you will travel to where the eclipse is total...
Aurora: Nature's Light Show
The aurora borealis or northern lights is one of nature’s most dazzling events. Shimmering curtains...
The Autumnal Equinox
Coming up next week is the Blood Moon. Also called the MegaMoon. Or, the Mega Harvest Moon. Or, the...
The Sun is Flipping Out!
Look up! You can see the biggest somersault in the solar system. The sun is in the middle of a...
The Sun Always Shines at Noon
Have you ever noticed that on an overcast day the sun will often break through the clouds close to ...
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 Fast Does the Sun Move?
The Sun Moves Ver-r-r-y Slowly The Sun is the center of our solar system, but it doesn't stay in...
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...
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