This type of photography is called Time Lapse. It is a technique which allows the camera to take a series of images at a set distance apart, for a set length of exposure, and a set number of images. The resulting images (usually hundreds of them) are Stitched together with software, where they produce a film clip of as many seconds as your images allow. It is absolutely imperitive that a tripod is used for this technique, because only the subject matter should move.
Intervalometer. You can read more about Intervalometers under Ancilliaries on the Equipment page. Some of the camera manufacturers produce their own, but these are invariably expensive. I learnt that they all do the same thing, so I bought one for about £8 online. They all work in a similar way, so are fairly easy to get right. You may notice several black flashes during the video, these are single frame images where birds have flown across the scene, which shows how important consistancy is. Redhill - Lincolnshire Wildlife Trust is at the top of a hill near Stenigot, close to Louth. This is a really good Dark Sky site and some amazing pictures can be obtained here of The Night Sky, and in particular, The Milky Way. After a good couple of hours capturing images of Stars, Star-Trails, etc, the sun was starting to come up, so I decided to capture several hundred images of the Sunrise. This was the result. In hind sight, and given the knowledge I now have, the maximum amount of images which can be set by the Intervalometer is 399, but hitting the "Start" button again would double the length of video produced. Hopefully in a future Time Lapse film clip, these video clips will be a minute or longer.