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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:A pier is gently lowered into place by a crane.
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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:The Bracewell Radio Sundial's gnomon casts a faint shadow on the afternoon of a cloudy day. IN the background, the VLA observes a radio source unaffected by the clouds.
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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:The long, ellipsoidal arc of Cassiopeia A's radio shadow track stretches out into a road, although for practical purposes the plaques do not extend quite so far. A portion of the Cygnus A radio shadow track is also seen.
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Start Date:1979 |
Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--non-NRAO instrument |
Description:One of Bracewell's sundials at the Heliopolis site in 1979, constructed from a radio telescope gear wheel.
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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:The large, central disk (20-inch (51 cm) diameter) anchoring the entire pattern at noon on the equinoxes. One of the two dial mottos can be read along the bottom edge.
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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:The polished stainless steel gnomon (18-inch (46 cm) diameter) reflecting the photographer, the sundial and the near-horizon skies above the Plains of San Agustin.
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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:The 3 antenna-shaped markers indicating related radio astronomy observatories, including Bracewell's Heliopolis. They are positioned at the VLA solar time corresponding to each observatory's local solar noon.
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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:The 7 miniature plaques commemorating dates important in the history of radio astronomy. The sun's shadow passes over each marker on the date it commemorates.
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People:Bracewell, Mark
Bracewell, Wendy |
Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:Ribbons are cut by Mark and Wendy Bracewell for the official "first shadow" at precisely solar noon. Note the gnomon's shadow covering the large central disk.
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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:Sample sidereal time markers for the radio sources Cassiopeia A. Cygnus A and Centaurus A. The sidereal time at which the disk would fall in the gnomon's "radio shadow" is indicated beneath a drawing of the traditional constellation (and its brightest stars) in which the source can be found. The exact location of the radio source within the visible constellation is indicated by a plus symbol. Each stainless steel disk is bordered by a beveled "rust bloom" steel border. [show more]
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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:A sign on the VLA's self-guided walking tour explains the radio sundial to visitors.
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Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:Sample solstice and equinox markers with subtle seasonal patterns decorating the outer rims.
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People:Goss, Miller |
Creator:Papers of Ronald N. Bracewell Series:Additional Materials About Bracewell Series Unit:Bracewell Sundial at the VLA Unit Type:Still Image Subject:Instruments--Bracewell Radio Sundial |
Description:Goss demonstrates how the sundial can be used as a sighting device for where each of three radio sources lies: place your eye as close as possible to the relevant radio source's disk and look on past the gnomon.
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