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: Shares of satellite imaging specialist DigitalGlobe (NYSE: DGI) fell behind a cloud today; prices dropped as much as 13.6% on about double the average trading volume.

So what: DigitalGlobe's third-quarter results are set to be reported after market close today, but rival GeoEye (Nasdaq: GEOY) published its own results last night. Earnings fell below Street targets, and so did next-quarter guidance figures, so nobody is expecting much out of DigitalGlobe tonight.

Now what: GeoEye's main pain point came from slow government orders. The two companies are indeed very comparable -- except for the fact that DigitalGlobe tends to squander a much fatter gross profit on very high operating expenses. Keep an eye on that line of Digital's results this time.

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