A star trail is a type of photograph that uses long exposure times to capture diurnal circles, the apparent motion of stars in the night sky due to Earth`s rotation. A star-trail photograph shows individual stars as streaks across the image, with longer exposures yielding longer arcs. The term is used for similar photos captured elsewhere, such as on board the International Space Station and on Mars.
Typical shutter speeds for a star trail range from 15 minutes to several hours, requiring a `Bulb` setting on the camera to open the shutter for a period longer than usual. However, a more practiced technique is to blend a number of frames together to create the final star trail image.
Star trails have been used by professional astronomers to measure the quality of observing locations for major telescopes.
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標準授權 | XS | 480 x 320 | JPG | 13 | |
標準授權 | S | 800 x 533 | JPG | 15 | |
標準授權 | M | 2121 x 1414 | JPG | 18 | |
標準授權 | L | 2738 x 1825 | JPG | 20 | |
標準授權 | XL | 3464 x 2309 | JPG | 22 | |
標準授權 | MAX | 8256 x 5504 | JPG | 23 | |
標準授權 | TIFF | 11676 x 7784 | TIF | 39 | |
進階授權 | WEL | 8256 x 5504 | JPG | 88 | |
進階授權 | PEL | 8256 x 5504 | JPG | 88 | |
進階授權 | UEL | 8256 x 5504 | JPG | 88 |
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標準授權 | 480 x 320 px | JPG | 13 點 |
標準授權 | 800 x 533 px | JPG | 15 點 |
標準授權 | 2121 x 1414 px | JPG | 18 點 |
標準授權 | 2738 x 1825 px | JPG | 20 點 |
標準授權 | 3464 x 2309 px | JPG | 22 點 |
標準授權 | 8256 x 5504 px | JPG | 23 點 |
標準授權 | 11676 x 7784 px | TIF | 39 點 |
進階授權 | 8256 x 5504 px | JPG | 88 點 |
進階授權 | 8256 x 5504 px | JPG | 88 點 |
進階授權 | 8256 x 5504 px | JPG | 88 點 |