DÉDIÉ À L’OBSERVATION DE L'ÉCLIPSE TOTALE DU SOLEIL DU 8 AVRIL 2024 EN TOUTE SÉCURITÉ!
The eclipse is over.
We hope you enjoyed it!

Une autre ÉCLIPSE TOTALE
du soleil arrive en
Amérique du Nord!

C’est la grande éclipse nord-américaine!
...et nous souhaitons que tout le monde puisse la voir!

L’utilisation des informations présentes sur ce site est conditionnelle à l’accord et à la compréhension de l’énoncé suivant : je suis d’accord avec les mises en garde et je ferai preuve d’un sens commun en plus de respecter tous les protocoles établis pour la sécurité des yeux lors de l’observation de tout phénomène solaire.

Nouvelles:
Calculations – Eclipse 2024 blog

# Eclipse Blog

## 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),...