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 13% in intraday trading today after announcing it received a large order.

So what: The company received an order from an unnamed Chinese company for $460 million of advanced sapphire crystallization furnaces. The order will be included in GT Solar's backlog for the current quarter.

Now what: This is GT Solar's largest order to date. The $460 million is more than half of the company's trailing 12-month revenue of $899 million and thus could provide a nice jump up in revenue and profits. While the announcement did not disclose the expected time frame for delivery of the furnaces, it suggests GT Solar's outlook is sunny.

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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.