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> Star trails around the south celestial pole

Star trails around the south celestial pole

author: Anglo-Australian Observatory/David Malin Images/Novapix

reference: a-pas01-10000

Image Size 300 DPI: 27 * 29 cm

By pointing a camera towards the south (or to the north in the northern hemisphere) at night, we can record the paths of stars which never set. They appear to circle the apparent position of the Earth's axis of rotation projected on the sky. The elevation of this  position above the local horizon indicates our local geographical latitude, about 30 degrees south at Siding Spring. The angle swept out by the arcs is an indication of the exposure time, which was about 10.5 hours on 400 ISO colour film. This kind of exposure is only possible from an extremely dark site.

Keywords for this photo:

1979 - AAO - AAT - ASTRONOMY - AUSTRALIA - CIRCUMPOLAR - DOME - LANDSCAPE - NIGHT - OBSERVATORY - ROTATION - SIDING SPRING - SILHOUETTE - SOUTH CELESTIAL POLE - SOUTHERN HEMISPHERE - STAR - STAR TRAILS - STARRY SKY - TREE -