The WorldWide Telescope (WWT) Add-in for Excel enables users to visualize location-based data, with latitude/longitude or right ascension/declination, in WWT. This is achieved by sending data from Excel to WWT with the use of loosely coupled application-programming interfaces exposed by WWT. The Excel add-in enables users to leverage the power of Excel for importing external location-based data with different formats and to visualize them in WWT. Users can share WWT visualization parameters with this Excel Add-in.