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A Total Solar Eclipse is Coming to the United States!
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Latest News

    2017 Eclipse Blog / FAQ



    ‘calculations’ Archives

    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, … Read More »



    How fast is the shadow moving across the US 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.

    shadow_scrape

    And whenever that shadow happens to … Read More »



    The eclipse2017.org app is live for Android and iOS!

    This is the SIMPLEST app to use, of all the apps out there.

    100% Ad-free! (even in the free version!)

    And NO Astronomy degree required! Simply give it your location, and it’ll tell you whether you’re in the path of totality or not, and also when the eclipse happens … Read More »



    How do you know this far in advance where the eclipse is going to be visible?

    A lot of math.

    No, seriously, astronomers do know the equations that model the motions of the Earth and Moon extraordinarily accurately. Eclipse predicting has been around for thousands of years, but with the computers we have now, those predictions are actually very quick and VERY accurate.

    What is … Read More »



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