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In this photograph, the Sun is visible above the top of the streetlight. In the reflection on the water, the Sun appears in line with the streetlight
In this photograph, the Sun is visible above the top of the streetlight. In the reflection on the water, the Sun appears in line with the streetlight because the virtual image is formed from a different viewing position.
Parallax measurements may be an important clue to understanding three of the universe's most elusive components: dark matter, dark energy and neutrino
Parallax measurements may be an important clue to understanding three of the universe's most elusive components: dark matter, dark energy and neutrinos.
Hubble Space Telescope precision stellar distance measurement has been extended 10 times further into the Milky Way.
Hubble Space Telescope precision stellar distance measurement has been extended 10 times further into the Milky Way.
Contax III rangefinder camera with macro photography setting. Because the viewfinder is on top of the lens and near the subject, goggles are fitted in
Contax III rangefinder camera with macro photography setting. Because the viewfinder is on top of the lens and near the subject, goggles are fitted in front of the rangefinder and a dedicated viewfinder is installed to compensate for parallax.
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The Dollond heliometer of the late 1700s
The Dollond heliometer of the late 1700s
Bessel's heliometer
Bessel's heliometer
The split lens of the Bamberg Heliometer (late 19th century)
The split lens of the Bamberg Heliometer (late 19th century)
Diagram of a heliometer from the 1911 Encyclopædia Britannica, which would be a view looking towards the split lens of a heliometer
Diagram of a heliometer from the 1911 Encyclopædia Britannica, which would be a view looking towards the split lens of a heliometer