Results 21 to 30 of about 477,612 (260)

Astronomical seeing at Maidanak Observatory

open access: yesНаучные труды Института астрономии РАН, 2023
Атмосферное качество астрономического изображения было исследовано с помощью прибора DIMM — измерите- ля дифференциальных дрожаний звезд для оценки интегральной турбулентности над обсерваторией. Была также изучена приземная составляющая данного параметра путем сравнения оценок качества изображения, полученного на разных высотах.
openaire   +1 more source

Lucky exposures: diffraction limited astronomical imaging through the atmosphere [PDF]

open access: yes, 2003
The resolution of astronomical imaging from large optical telescopes is usually limited by the blurring effects of refractive index fluctuations in the Earth’s atmosphere. By taking a large number of short exposure images through the atmosphere, and then
Tubbs, Robert Nigel
core   +2 more sources

Benefits of Intelligent Fuzzy Controllers in Comparison to Classical Methods for Adaptive Optics

open access: yesPhotonics, 2023
Adaptive Optics (AO) systems have been developed throughout recent decades as a strategy to compensate for the effects of atmospheric turbulence, primarily caused by poor astronomical seeing.
Victor Costa, Wesley Beccaro
doaj   +1 more source

Site characterisation : astronomical seeing from a turbulence-resolving model [PDF]

open access: yes, 2011
A Lunar Laser Ranging (LLR) system is to form part of geodetic instrumentation to be located at a new fundamental space geodetic observatory for South Africa.
Djolov, George D.   +4 more
core   +1 more source

Astronomical seeing statistics in Ulupınar astrophysical observatory [PDF]

open access: yes, 2011
Fen Bilimleri Enstitüsü, Uzay Bilimleri ve Teknolojisi Ana Bilim DalıBu tez çalışmasında, Çanakkale Onsekiz Mart Üniversitesi Ulupınar Astrofizik Gözlemevi'nde 2008 yılında T40 teleskopuna bağlı SBIG STL-1001E CCD kamera ile elde edilen görüntülerdeki ...
Elkıran, Yusuf Mete
core   +1 more source

The 5.25 & 5.7 $\mu$m Astronomical Polycyclic Aromatic Hydrocarbon Emission Features [PDF]

open access: yes, 2008
Astronomical mid-IR spectra show two minor PAH features at 5.25 and 5.7 $\mu$m (1905 and 1754 cm$^{\rm - 1}$) that hitherto have been little studied, but contain information about the astronomical PAH population that complements that of the major ...
Boersma, C.   +6 more
core   +1 more source

KEBIJAKAN PEMERINTAH DALAM PENETAPAN AWAL BULAN KAMARIAH DI INDONESIA

open access: yesJurnal Madania, 2014
Governmental Policy in Deducing Early Islamic Calendar in Indonesia. There is different argumentation among Muslim scholars to determine early Islamic Calendar. Part of them argued that we should put it considerably based on the result of seeing moon (ru’
Jayusman Jayusman
doaj   +1 more source

Astronomical seeing forecast for the Thai National Observatory

open access: yesJournal of Physics: Conference Series, 2021
Abstract Forecasting the astronomical seeing above an observatory can assist astronomers plan their observations. In this study, the astronomical seeing above the Thai National Observatory (TNO) in Doi Inthanon, Chiang Mai, Thailand was simulated using the Weather Research and Forecasting (WRF) model. The model outputs were then compared
Ronald Macatangay, Somsawat Rattanasoon
openaire   +1 more source

الظواهر الفلكية المؤثرة في فريضة الصيام دراسة فقهية في ظل تطور الوسائل الفلكية Astronomical Phenomena Affecting The Obligation Of Fasting A Jurisprudential Study In Light Of The Development Of Astronomical Methods [PDF]

open access: yesمجلة البحوث الفقهیة والقانونیة
ضم البحث بين طياته جملة من المسائل الفقهية التي تناولت الحديث عن الظواهر الفلكية المؤثرة في فريضة الصيام في ضوء الوسائل الفلكية المعاصرة، بهدف دراسة تلك المسائل دراسة فقهية، مع بيان أثر الوسائل الفلكية المعاصرة عليها، مثل اختلاف مطالع الهلال وأثره في ...
سهام عبدالله صابر
doaj   +1 more source

The Benefits of Using XML Technologies in Astronomical Data Retrieval and Interpretation [PDF]

open access: yes, 2016
This paper describes a solution found during recent research that could provide improvements in the efficiency, reliability and cost of retrieving stored astronomical data.
Doicu, Adrian   +69 more
core   +2 more sources

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