The Android app can display past or future positions of stars in the sky.
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Google has deliberately chosen not to implement certain controversial technologies, like facial recognition, in its software. However, it doesn't see a problem with peering into the past or future.
The company's Google Sky Map application, available for devices running Android 1.6 and higher, can now provide just such perspective. It's not quite time travel, despite Google's use of the term, but it's as close as anyone is likely to get without approaching the speed of light in a space ship.
"Today, the new version of Google Sky Map lets you time travel to see the sky at a specific date, past or future," said Google's Hector Ouilhet in a blog post. "After smooth travel to the desired year, you can fast forward or rewind in various speeds and watch how the sky changes."
Ouilhet bears the title "lunatic designer" in the blog post, presumably for his association with lunar and stellar projects rather than for any mental instability.
This is not the first Google service capable of showing the passage of time. Last month, Google published archival imagery in Google Earth, allowing users to see London in pictures from 1945 up through the present.
The latest version of Google Sky Map can be obtained at no cost by visiting the Android Market using an Android phone or by scanning the QR code provided on Google's blog post.
Google in the Enterprise SurveyThere's no doubt Google has made headway into businesses: Just 28 percent discourage or ban use of its productivity products, and 69 percent cite Google Apps' good or excellent mobility. But progress could still stall: 59 percent of nonusers distrust the security of Google's cloud. Its data privacy is an open question, and 37 percent worry about integration.