Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: GT Solar International (Nasdaq: SOLR) popped 15% in intraday trading today after reporting better-than-expected earnings and raising guidance for fiscal 2012.

So what: EPS of $0.41 grew 78% year over year and trounced the consensus estimate of $0.34. Management raised guidance for the fiscal year ending in April 2012 to $1.55 to $1.85 (growth of 25% to 49%) from $1.25 to $1.50.

Now what: The impressive EPS growth was driven by revenue growth of 39%, improvement in gross and operating margins, and a 12% reduction in share count. The company expects fiscal 2012 revenue of $1.0 billion to $1.1 billion and started the fiscal year with a backlog of $1.2 billion. With a P/E ratio of only 9.2, and a Motley Fool CAPS rating of four stars, the sun could continue shining on GT Solar's investors.

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Fool contributor Cindy Johnson owns shares of GT Solar International. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.