Techniques for Accurate Parallax Measurements for 6.7-GHz Methanol Masers [PDF]
, 2017 The BeSSeL Survey is mapping the spiral structure of the Milky Way by measuring trigonometric parallaxes of hundreds of maser sources associated with high-mass star formation. While parallax techniques for water masers at high frequency (22 GHz) have been well documented, recent observations of methanol masers at lower frequency (6.7 GHz) have revealed
arxiv +1 more source
Ophthalmic and Physiological Optics, Volume 45, Issue 3, Page 820-833, May 2025.Abstract Purpose To report the repeatability and accuracy of viewing distance and ambient illumination measured with the Vivior and Clouclip wearable sensors in a controlled laboratory setting and while young adults performed different near visual tasks.
Samrat Sarkar +3 more
wiley +1 more source
Journal of Morphology, Volume 286, Issue 4, April 2025.We used geometric morphometry to identify shell landmark differentiation in the Mediterranean mussel Mytilus galloprovincialis across the eastern Adriatic Sea. The results revealed that an elongated shell shape was particularly characteristic of southern populations and those from environments with lower salinity concentrations.
Marina Piria +5 more
wiley +1 more source
Time‐multiplexing method using dual ferroelectric liquid crystal shutters for light field 3D display
Journal of the Society for Information Display, Volume 33, Issue 4, Page 246-254, April 2025.An array‐type ultrafast ferroelectric liquid crystal light valve compatible with conventional liquid crystal driving schemes was fabiricated and studied. The charge compensation issues in binary switched FLC are overcomed by combining a reference FLC cell and another array type FLC valve array.
Zhi‐Bo Sun +8 more
wiley +1 more source
From Sailors to Satellites: A Curated Database of Bioluminescent Milky Seas Spanning 1600‐Present
Earth and Space Science, Volume 12, Issue 4, April 2025.Abstract Milky seas are a rare, historically fabled form of marine bioluminescence. Characterized by their steady, non‐flashing, eponymous white glow; milky seas are capable of illuminating over 100,000 km2 ${\text{km}}^{2}$ of the nocturnal ocean surface for months at a time.
J. Hudson, S. D. Miller
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Simple demonstration experiments for astronomical parallax [PDF]
arXiv, 2017 Parallax is the most important astronomical method for determining the distances from the Earth to nearby stars. We present two hands-on activities that explore the concepts and practice of parallax measurement. The first activity is a simple geometrical set-up using simple theodolites, and is accessible for students grade 7 and above.
arxiv
On a Method of finding the Parallax of Double Stars, and on the Displacement of the Lines in the Spectrum of a Planet [PDF]
, 1874 C. Niven
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On the Solar Parallax derived from Observations of Mars at Asccension in 1877 [PDF]
, 1881 David Gill
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Reduction of 295 Photographs of Eros made at Nine Observatories during the period 1900 November 7-15, with a determination of the Solar Parallax [PDF]
, 1904 Arthur R. Hinks
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Analysis of the Gaia Data Release 3 parallax bias at bright magnitudes [PDF]
arXivThe combination of visual and spectroscopic orbits in binary systems enables precise distance measurements without additional assumptions, making them ideal for examining the parallax zero-point offset (PZPO) at bright magnitudes (G < 13) in Gaia.
arxiv