Equirectangular
When one photograph makes your head spin 360° horizontally and 180° vertically.

An equirectangular image is a format used to present a full sphere of view. Each pixel is like the coordinates on a map: latitude and longitude. Most of these images are best seen in the interactive view (using a plug-in called Spi-V, needs Shockwave).

To see how I take and edit those panoramas, have a look at this forum post.
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