Credit & Copyright: Branko Nadj
Explanation:
Savudrija lighthouse
shines along the coast
near the northern end of the Istrian peninsula
in this well-composed
night
skyscape.
A navigational aid for sailors on the Adriatic Sea,
the historic lighthouse was constructed in the early 19th century.
But an even older aid to navigation shines in the sky
above, Polaris,
alpha star of the constellation Ursa Minor and also known as the North Star.
In this scene Polaris forms the shortest
bright arc near the
North Celestial Pole, the extension of
Earth's axis of rotation into space.
Of course, the North Celestial Pole lies exactly at the center of
all the concentric startrails.
The composite
image
is a digital stack of 400 exposures, each 30 seconds
long, taken with camera and tripod fixed to a rotating planet.
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 |
Yanvar' Fevral' Mart Aprel' Mai Iyun' Iyul' Avgust Sentyabr' Oktyabr' Noyabr' Dekabr' |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
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star trail - sledy zvezd
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