Star trails

IMAGE DETAILS

Date + Time ...............................   1 / 4/ 2012 - 18:10 UTC
Location ....................................   Skiathos
Optics .........................................
  Canon EFS 18-200mm (working at 18mm)
Camera .....................................   Canon Eos 50D
Exposure Time........................    15 sec / ISO 2000
Mount .......................................   portable tripod
Processing Details .................   Star trails - Maxim dl - Photoshop

Details .....................................    58 frames used.
You can also see an aeroplane crossing the image  , and a satelite (upper right).
Star trail is the line of light recorded on a photographic medium when a time exposure is made of a star in the nighttime sky using a camera on a fixed mount, caused by the rotation of the earth during the period of time when the camera's shutter is held open.

Nikos Paschalis