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The Sun moving sideways on the South Pole | by josefrancisco.salgado
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The Sun moving sideways on the South Pole

During the daylight months at the South Pole the Sun moves around the sky at (almost) the same altitude over the horizon without rising or setting. It does change altitude from day to day as it moves along the ecliptic (its apparent path against the background stars as the Earth orbits around it). The Sun rises on the Vernal Equinox (Sep 22/23), reaches its highest altitude of 23.4 deg on the Summer Solstice (Dec 22/23), and sets on the Autumnal Equinox (Mar 20/21). On the day of this multiple exposure the Sun was at 19.2 deg over the horizon.


NB: The Sun and the Moon (both about 0.5 deg in angular size) appear to move their own diameter every 2 minutes in the sky. The interval here is 3 minutes hence the spacing between solar disks.


21 exposures | Nikon D3s + 24-70mm f/2.8G + ND filter | South Pole Telescope, Antarctica, 18 Nov 2011

© 2011 José Francisco Salgado, PhD

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Taken on November 18, 2011