DEDICATED TO THE SAFE OBSERVATION OF
THE TOTAL SOLAR ECLIPSE OF APRIL 8, 2024!
years months days
until ECLIPSE DAY!
ESPAÑOL | FRANÇAIS
 
ESPAÑOL | FRANÇAIS
DEDICATED TO THE SAFE OBSERVATION OF THE TOTAL SOLAR ECLIPSE OF APRIL 8, 2024!
years months days
until ECLIPSE DAY!
 
 
Another TOTAL ECLIPSE
is coming to
North America!

It’s the Great North American Eclipse!
...and we want everyone to see it!
 
Your use of this site is contingent on your understanding and agreement that you will comply
with all the rules and protocols for eye safety when observing any solar phenomenon.
 
Your use of this site is contingent on your understanding and agreement that you will comply with all the rules and protocols for eye safety when observing any solar phenomenon.
Latest News:
  • Latest news about the 2024 eclipse will go here.
  • Eclipse2024.org is building great content - check in often!
  • Latest news about the 2024 eclipse will go here.
  • Eclipse2024.org is building great content - check in often!
Calculations – Eclipse 2024 blog

Eclipse Blog

The world is coming to North America to see an eclipse!

How fast is the shadow moving across the continent during the eclipse?

A great question! The Moon does indeed "carry" its shadow along with it, as it moves in its orbit around the Earth. And whenever that shadow happens to scrape across the Earth, we have a total eclipse!  (Of course, you have to be in the Path of Totality to see the total eclipse, and you have to use eye protection whenever the eclipse is not total - regardless of whether...

Why does the eclipse go from West to East across the continent?

  The Sun and Moon both appear to "rise" in the east, and "set" in the west.  But as you can see in our video of the Moon's shadow sweeping across the USA for the 2017 eclipse, you see that the shadow plainly traveled from west to east across the country! This is a very good question, because it shows how solar eclipses take us out of our normal experience....

Magnitude vs. Obscuration?

Whenever eclipse geeks are talking about their calculations, they always need to make sure they are careful to distinguish as to whether they're talking about "magnitude" or "obscuration".  In case you'd like to understand this, too, here is a quick explanation. I'm going to use the word "percentage" below, but if you want to substitute "fraction" or even "amount" (so long as you understand what you mean by that word),...